In the context of social relations I would describe power as "the ability to impose one's will upon another". I consider that immoral, thus any government that utilizes such a principle I consider illegitimate. — Tzeentch
Is modern psychology flawed? — Qwex
We do not have the time or the data required to carry out the verification procedure. — Isaac
None of the solutions on offer can be verified and yet we need to act. — Isaac
Buy a gun. — Lif3r
For example, when discussing technological change in energy production in chapter "Technology and the limits to growth", the authors see only one and only one alternate candidate in energy production to replace fossil fuel based energy production, and that is nuclear fission power. — ssu
As a result of its participation in the US government's military program for nuclear energy applications (e.g. The Nuclear Navy) Westinghouse was instrumental in the development and commercialization of nuclear energy systems for electric power generation. This business currently operates as the Westinghouse Electric Company, and is owned by Toshiba of Japan. — Westinghouse is now owned by Japanese interests
You have given absolutely no support for your assumption that solutions are either verifiable or not. — Isaac
We draw evidence, based on our experience, to judge the liklihood that a solution will work. — Isaac
doing the right thing requires the political work of a "doctor," as Socrates put it, as opposed to a "candy store clerk." — Michael Lee
The doctor would never be voted into office because most people do not behave the way they do in accordance with reason — Michael Lee
Ok. you can 'declare particular sentences to be 'true'. But what then? What logical process are you going to use to find those sentences that 'necessarily follow from those basic sentences'? — A Seagull
Even if you do have such a logical process, those sentences that follow and are declared 'true' are only true within that particular system; ie they rely on the truth of the original basic sentences for their truth. — A Seagull
You cannot have a scam without there being legitimacy. One cannot be deceived unless there is a truth of the matter. — unenlightened
#1 How can one know what truth is, without knowing what truth is in the first place? — Monist
So no answer to the actual question then? — Isaac
A good school for democratic leaders would be a democratic school. — unenlightened
If words like black and white were involved, instead of the jargon words dead and living, he would see at once that language was being used in an improper way. Many political words are similarly abused. The word Fascism has now no meaning except in so far as it signifies ‘something not desirable’. The words democracy, socialism, freedom, patriotic, realistic, justice have each of them several different meanings which cannot be reconciled with one another. In the case of a word like democracy, not only is there no agreed definition, but the attempt to make one is resisted from all sides. It is almost universally felt that when we call a country democratic we are praising it: consequently the defenders of every kind of regime claim that it is a democracy, and fear that they might have to stop using that word if it were tied down to any one meaning. Words of this kind are often used in a consciously dishonest way. That is, the person who uses them has his own private definition, but allows his hearer to think he means something quite different. Statements like Marshal Petain was a true patriot, The Soviet press is the freest in the world, The Catholic Church is opposed to persecution, are almost always made with intent to deceive. Other words used in variable meanings, in most cases more or less dishonestly, are: class, totalitarian, science, progressive, reactionary, bourgeois, equality. — George Orwell in Politics and the English language
But what if you needed, nonetheless, to make a decision in a field who's paperwork cannot be verified mechanically? Let's say economics. — Isaac
Taleb and Nobel laureate Myron Scholes have traded personal attacks, particularly after Taleb's paper with Espen Haug on why nobody used the Black–Scholes–Merton formula. Taleb said that Scholes was responsible for the financial crises of 2008, and suggested that "this guy should be in a retirement home doing Sudoku. His funds have blown up twice. He shouldn't be allowed in Washington to lecture anyone on risk."[4] — Wikipedia, Taleb on Myron Scholes
If I had to relive my life I would be even more stubborn and uncompromising than I have been. One should never do anything without skin in the game. If you give advice, you need to be exposed to losses from it. — Nassim Taleb on being stubborn and disagreeable
Often 'experts' are just a shortcut to knowledge which you yourself could verify but not in the space of time you have by which you need to make an informed decision. — Isaac
1. In order to learn this stuff about Big Pharma, about which we both agree, you had to trust someone on the basis of their purported expertise. You did not personally find all this out, you listened to experts - whether they we investigative journalists, drug database system administrators, certification authorities, testing labs - you had to decide that these people were likely to be telling you the truth. You say you used corroboration, but that is exactly the method used to assess all experts at a base level. — Isaac
Empty suit problem ( or “expert problem” ): some members of professions have no differential abilities from the rest of the population, but, for some reason, and against their empirical record, are believed to be experts: clinical psychologists, academic economists, risk experts, statisticians, political analysts, financial experts, military analysts, CEOs. etc. They dress up their expertise in beautiful language, jargon, mathematics, and often wear expensive suits. — Nassim Nicholas Taleb, Black Swan, Impact of the highly improbable
2. In trusting the Asian alternative companies you are presuming, without warrant, that simply because they are not engaged in the deceitful activities of the Big Pharma, they are not engaged in any unsavoury activities at all. Again, this is either an act of trust, or it is monumentally naive. There are all sorts of ways in which these companies might make money at someone's expense, even if the actual molecule they supply is the same one Big Pharma do. That is not the only effect a company has in conducting it's affairs. — Isaac
You cannot personally verify any of these things. To do so you must decide to trust experts. — Isaac
If they're offering the thing cheaper it's because they're not paying for something the more expensive companies are paying for. To conclude that they're worth going for, you need to know what that something is and be sure you can do without it. — Isaac
To know that you have to trust somebody who is an expert in the field telling you what that thing is. — Isaac
I wouldn't trust some random Internet sale with my health. That would be borderline lunacy. — Isaac
How do I even know the pill contains anything but sugar? — Isaac
How do I know adverse reactions will be properly accounted? — Isaac
Yes, but to advocate them, you need to trust that they are at least not worse, ie that no corners have been cut in order to secure that lower price. How can you possibly know that? Lowering the price by using lower quality materials, quality and safety checks, and worse manufacturing techniques is also a known process, so I don't see where this gets you so far as choosing between the two is concerned. — Isaac
'Profiteering'. With some drugs costing upwards of $100,000 for a full course, and with the cost of manufacturing just a tiny fraction of this, it's not hard to see why. — BBC News on cost of manufacturing in pharma
Drug companies justify the high prices they charge by arguing that their research and development (R&D) costs are huge. ... But as the table below shows, drug companies spend far more on marketing drugs - in some cases twice as much - than on developing them. ... Big pharma companies also say they only have a limited time in which to make profits. — BBC News on pharma manufacturing cost
But drug companies have been accused of, and admitted to, far worse. Until recently, paying bribes to doctors to prescribe their drugs was commonplace at big pharmas, although the practice is now generally frowned upon and illegal in many places. GSK was fined $490m in China in September for bribery and has been accused of similar practices in Poland and the Middle East. Indeed a recent study found that doctors in the US receiving payments from pharma companies were twice as likely to prescribe their drugs. Drug companies have also been accused of colluding with chemists to overcharge for their medicines. They have also been found guilty of mis-branding and wrongly promoting various drugs. — BBC News on Big Pharma bribery
I'm talking about where the problem with any alternative might lie. Companies producing cheap knock-offs are motivated by exactly the same greed as the big companies. — Isaac
They have exactly the same ability to extort and manipulate laws (albeit more likely with bribes than lobbying). — Isaac
It's not your assessment of the problem I take issue with, it's your assessment of the solution. — Isaac
It's a tool for mathematical theorms. Hence it is pseudo-technical to suggest it could apply outside of mathematics. Unless someone in a technical field has made that connection. — Isaac
Whom you'd have to trust to be providing you with the correct information. — Isaac
What is methimazole? Methimazole prevents the thyroid gland from producing too much thyroid hormone. Methimazole is used to treat hyperthyroidism (overactive thyroid). It is also used before thyroid surgery or radioactive iodine treatment. — drugs.com on methimazole
Where you'd have to trust the certification system. ... Whose processes and integrity you'd have to take on trust. — Isaac
What I objected to is your demented anti-western bias making out that Indian companies are going to be any better than the Western ones. — Isaac
If Western companies are bumping up prices by some illicit means, then the Indian company is probably cutting prices by some equally illicit means. — Isaac
Regulatory capture (also client politics) is a corruption of authority that occurs when a political entity, policymaker, or regulatory agency is co-opted to serve the commercial, ideological, or political interests of a minor constituency, such as a particular geographic area, industry, profession, or ideological group[1].[2] When regulatory capture occurs, a special interest is prioritized over the general interests of the public, leading to a net loss for society. — Wikipedia on regulatory capture
FDA Depends on Industry Funding; Money Comes with 'Strings Attached'. The system at the FDA is 'unique in the degree to which industry sets the terms of the agenda,' said Daniel Carpenter, a Harvard professor of government who has published work on the FDA and on 'regulatory capture,' a process by which special interests gain influence over their regulators. — Project On Government Oversight on Regulatory Capture of FDA
We cannot do that without trust. You're acting as if we can eliminate empirical data somehow and somehow derive knowledge without it. Somewhere along the line we'd have to include empirical data the gathering of which we were not personally involved in. — Isaac
I for one would rather trust what an experienced lab technician said happened than what I think I saw. — Isaac
In 2007, it paid out one of the largest fines ever levied against a pharmaceutical firm for mislabeling its product OxyContin, and three executives were found guilty of criminal charges.[3][4] — Wikipedia on Purdue Pharma
Opioid Crisis. The Nation is in the midst of an unprecedented opioid epidemic. More than 130 people a day die from opioid-related drug overdoses. — USA/HRSA administration on opioid crisis
pseudo-technical garbage — Isaac
Coq is a formal proof management system. It provides a formal language to write mathematical definitions, executable algorithms and theorems together with an environment for semi-interactive development of machine-checked proofs. Typical applications include the certification of properties of programming languages (e.g. the CompCert compiler certification project, the Verified Software Toolchain for verification of C programs, or the Iris framework for concurrent separation logic), the formalization of mathematics (e.g. the full formalization of the Feit-Thompson theorem, or homotopy type theory), and teaching. — Mission statement of the Coq proof assistant
its not possible to personally verify either of the rival claims (which is what I'd already said) — Isaac
Sun Pharmaceuticals is the largest pharmaceutical company from India and the fifth largest specialty generic company in the world. It has capabilities across dosage forms like injectables, sprays, ointments, creams, liquids, tablets and capsules. Its businesses include producing generics, branded generics, speciality, over the counter (OTC) products, anti-retrovirals (ARVs), Active Pharmaceutical Ingredients (APIs) and intermediates in the full range of dosage forms. It also produces specialty APIs. US formulations contributed the most to company’s US$ 4 billion sales in FY18 with a contribution of 34 per cent, followed by India branded formulations at 31 per cent. — IBEF record for Sun Pharmaceuticals in Uttar Pradesh, India
If western pharmaceutical companies are just out to make money by bumping up prices, then why aren't the Indian ones just out to make money by cutting corners on quality? If the medical journals can't be trusted to print the truth becasue of their biases and their sponsors, then why can those sources you just cited who have biases and revenue streams to consider too? — Isaac
And you trust the medical websites and search engines to provide you with a statistically viable sample? Why? You've tested them personally have you? Your own lab facitilies and access to controlled trials, remarkable. Assuming they're lying doesn't get you anywhere because it doesn't provide you with the alternative. Presuming everyone is lying just tells you anything you haven't directly tested yourself might be false. Great. Now what? You don't have the facilities to test everything yourself, so what are you going to do now? — Isaac
Don’t Trust Your Doctor. I’m a doctor, so I can say this with a straight face: Don’t trust your doctor. There’s no question in my mind that today most doctors are businessmen first and doctors second. — Dr. Peter Rost
A doctor tells you why you can't trust your doctor again. Your doctor is merely a pawn in a multi-billion dollar industry - while your health and well-being are a poor, distant second. — Doctors are becoming pawns of a system
Never ask the doctor what you should do. Ask him what he would do if he were in your place. You would be surprised at the difference. — Nassim Nicholas Taleb, Antifragile: Things That Gain From Disorder
Who do you go to when you get sick? — TheMadFool
Trust that the expert is concerned about your welfare — TheMadFool
I mean if an expert has no interest in your welfare then his knowledge/expertise is of no value to you for it can be withheld or misused. — TheMadFool
Pharma chief defends 400% drug price rise as a ‘moral requirement’. Nostrum Laboratories’ Nirmal Mulye says he is right to charge as much as possible and slams FDA. A pharma executive has defended his decision to raise the price of an antibiotic mixture to more than $2,000 a bottle, arguing there was a “moral requirement to sell the product at the highest price”. — Financial Times on the morality of the pharma oligarchy
for instance we consult not just any doctor but the best among them and the same applies to other areas of knowledge. — TheMadFool
Much of everything we know about mathematics was developed by that school. — Michael Lee
By the middle of the 1st Century BCE, the Roman had tightened their grip on the old Greek and Hellenistic empires, and the mathematical revolution of the Greeks ground to halt. Despite all their advances in other respects, no mathematical innovations occurred under the Roman Empire and Republic, and there were no mathematicians of note. The Romans had no use for pure mathematics, only for its practical applications, and the Christian regime that followed it (after Christianity became the official religion of the Roman empire) even less so. — storyofmathematics.com on Roman mathematics
I shudder to think of what would happen here if the posters on this and other threads with minimal mathematical knowledge apart from set theory and logic were to launch investigations into subjects like functional integration or even metric spaces or advanced calculus. — jgill
Curating the math corpus. So how big is the historical corpus of mathematics? There’ve probably been about 3 million mathematical papers published altogether—or about 100 million pages, growing at a rate of about 2 million pages per year. And in all of these papers, perhaps 5 million distinct theorems have been formally stated. — Stephen Wolfram on 'Curating the math corpus'
He attended the University of Waterloo but dropped out in 2014, when he received the Thiel Fellowship in the amount of $100,000,[10] and went to work on Ethereum full-time.[10] — Wikipedia on Vitalik Buterin
This is the third part of a series of articles explaining how the technology behind zk-SNARKs works; the previous articles on quadratic arithmetic programs and elliptic curve pairings are required reading, and this article will assume knowledge of both concepts. — Vitalik Buterin's article intro
Talk is cheap. Show me the code. — Linus Torvalds on 'cheap talk'
Cogito ergo sum. But I can only prove that with any 100% certainty to myself, not to you. — Artemis
Now, if one does a survey of higher learning, there's a degree for every conceivable subject the acquisition of which makes a student qualified and, fingers crossed, highly competent in the given subject. This has the benefit of making such qualified people into experts in their respective fields and thus become people we can put our trust in. — TheMadFool
trusting people to a degree is more efficient and certainly a lot nicer — Isaac
When we talk about trustless systems, we mean that our ability to trust it does not depend on the intentions of any particular party, which could be arbitrarily malicious. A trustless system allows you to trust in the system without needing to trust in the parties with which you’re transacting. — Trustless systems
And who told you about God? — Isaac
"Fitra" or "fitrah" (Arabic: فطرة; ALA-LC: fiṭrah), is the state of purity and innocence Muslims believe all humans to be born with. Fitra is an Arabic word that is usually translated as "original disposition," "natural constitution," or "innate nature."[1] According to Islamic theology, human beings are born with an innate inclination of tawhid (Oneness), which is encapsulated in the fitra along with compassion, intelligence, ihsan and all other attributes that embody the concept of humanity.[citation needed] It is for this reason that some Muslims prefer to refer to those who embrace Islam as reverts rather than converts, as it is believed they are returning to a perceived pure state.[2] — Wikipedia on the concept of Fitrah
In short we have an ingrained, fully justified, belief that to solve a particular problem we need to consult an expert in that field and to produce such experts we need schools and education programs in those fields. — TheMadFool
Here's my definition of infinity, and for simplicity I'm only referring to positive infinity: infinity is a number, but it has a characteristic that all real numbers do not possess. — Michael Lee
Good luck reading. MO as you know is a site for professional mathematicians so the best one can hope for is to understand a few of the words on the page. — fishfry
The standard reals are the Goldilocks model of the reals. Not too small and not too big to be Cauchy-complete. They're just right. And are therefore to be taken as the morally correct model of the reals. — fishfry
Very little of our initial, formative knowledge is formal. And what do you mean exactly by 'formal'? — Sir Philo Sophia
Turing stated it this way: It was stated ... that "a function is effectively calculable if its values can be found by some purely mechanical process". We may take this literally, understanding that by a purely mechanical process one which could be carried out by a machine. The development ... leads to ... an identification of computability† with effective calculability. — Statement of the Church-Turing thesis
why are you limiting the definition or process of knowledge building to formal knowledge? — Sir Philo Sophia
Math by enumeration. The first is to enumerate possible statements, and then to use (implicit or explicit) theorem-proving technology to try to determine which of them are true. And the second is to enumerate possible proofs, in effect treeing out possible ways the axioms can be applied to get theorems. It’s easy to do either of these things for something like Boolean algebra. And the result is that one gets a sequence of true theorems. But when I was working on A New Kind of Science, I did a simple experiment for the case of Boolean algebra. One day I’m sure doing this will be an important part of pure mathematical work. — Stephen Wolfram on 'Math by enumeration'
In a sense an axiom system is a way of giving constraints too: it doesn’t say that such-and-such an operator “is Nand”; it just says that the operator must satisfy certain constraints. And even for something like standard Peano arithmetic, we know from Gödel’s Theorem that we can never ultimately resolve the constraints–we can never nail down that the thing we denote by “+” in the axioms is the particular operation of ordinary integer addition. — Stephen Wolfram on the limitations of 'math by enumeration'
can you clarify in other terms what you mean here? I don't understand the logic/argument supporting "humanity would either have no knowledge at all, or else, have discovered all possible knowledge already" — Sir Philo Sophia
You invoked the extended real numbers and claimed it has something to do with L-S, which of course it does not. Unless I misunderstood your point. — fishfry
The supremum axiom of the reals refers to subsets of the reals and is therefore a second-order logical statement. It is not possible to characterize the reals with first-order logic alone: the Löwenheim–Skolem theorem implies that there exists a countable dense subset of the real numbers satisfying exactly the same sentences in first-order logic as the real numbers themselves. The set of hyperreal numbers satisfies the same first order sentences as R. Ordered fields that satisfy the same first-order sentences as R are called nonstandard models of R. This is what makes nonstandard analysis work; by proving a first-order statement in some nonstandard model (which may be easier than proving it in R), we know that the same statement must also be true of R. — Wikipedia on Löwenheim-Skolem in the context of real numbers
since the Ultrafilter Lemma isn't constructively acceptable — sime
Examples of non-trivial ultrafilters are difficult (if not impossible) to give, as the only known proof of their existance relies on the Axiom of Choice. — The 'Art of Solving Problems' on giving examples for the ultrafilter concept
America has no mainstream left-wing party, and the left-wing people are avidly anti-corporate and terribly disappointed in the Democrats. — Pfhorrest
Allah has permitted trade and forbidden usury. — Quran: 2:275- 279
Also, it's not so clear-cut that corporations are considered evil by religious people. Consider for example prosperity theology. — Pfhorrest
Prosperity theology has been criticized by leaders from various Christian denominations, including within the Pentecostal and Charismatic movements, who maintain that it is irresponsible, promotes idolatry, and is contrary to scripture. Secular as well as some Christian observers have also criticized prosperity theology as exploitative of the poor. — Wikipedia on prosperity theology
The magisterium of the Catholic Church is the church's authority or office to give authentic interpretation of the Word of God, "whether in its written form or in the form of Tradition."[1][2][3] According to the 1992 Catechism of the Catholic Church, the task of interpretation is vested uniquely in the Pope and the bishops.
Bishops, teaching in communion with the Roman Pontiff, are to be respected by all as witnesses to divine and Catholic truth. In matters of faith and morals, the bishops speak in the name of Christ and the faithful are to accept their teaching and adhere to it with a religious assent. This religious submission of mind and will must be shown in a special way to the authentic magisterium of the Roman Pontiff, even when he is not speaking ex cathedra; that is, it must be shown in such a way that his supreme magisterium is acknowledged with reverence, the judgments made by him are sincerely adhered to, according to his manifest mind and will. — Wikipedia on magisterium principle
Ijtihad (Arabic: اجتهاد ijtihād, [idʒ.tihaːd]; lit. physical or mental effort, expended in a particular activity)[1] is an Islamic legal term referring to independent reasoning[2] or the thorough exertion of a jurist's mental faculty in finding a solution to a legal question.[1] — Wikipedia on ijtihad
It means essentially that CH is equivalent to the fact that all models of the hyperreals are isomorphic. The idea is that the particular model of hyperreals you get depends on which nonprincipal ultrafilter you choose. If CH holds then all the models are isomorphic. — fishfry
The elements of any model of Peano arithmetic are linearly ordered and possess an initial segment isomorphic to the standard natural numbers. A non-standard model is one that has additional elements outside this initial segment. The construction of such models is due to Thoralf Skolem (1934). — Wikipedia on nonstandard models of arithmetic
There's a Mathoverflow thread about this, let me see if I can find it. Ah here it is. Good luck reading. MO as you know is a site for professional mathematicians so the best one can hope for is to understand a few of the words on the page. — fishfry
I don't know the answers to all the good questions you raise, but I can't help thinking that you're overthinking things and letting yourself get confused by Lowenheim-Skolem. — fishfry
The extra points don't participate in the field properties as I'm sure you know from calculus. — fishfry
This set together with the group operation of elliptic curves is an abelian group, with the point at infinity as an identity element. — Wikipedia on ECC
That's because religious morality is inherently a right-wing thing. Of course right-wing religious moralists think the existence of liberal left-wing morals is a sign of decadence and depravity. — Pfhorrest
The supremum axiom of the reals refers to subsets of the reals and is therefore a second-order logical statement. It is not possible to characterize the reals with first-order logic alone: the Löwenheim–Skolem theorem implies that there exists a countable dense subset of the real numbers satisfying exactly the same sentences in first-order logic as the real numbers themselves. — Wikipedia insisting that the reals are a second-order theory
In mathematics, a real closed field is a field F that has the same first-order properties as the field of real numbers. Some examples are the field of real numbers, the field of real algebraic numbers, and the field of hyperreal numbers. — Wikipedia on real closed fields which are a first-order theory
The first-order theory of real closed fields is the first-order theory whose primitive operations are addition and multiplication, primitive predicates are = and ≤, and axioms are those of a real closed field. More precisely, a first-order theory is roughly speaking, a theory where quantifiers apply only to elements (not to sets of elements).
Alfred Tarski proved (c. 1931) that the first-order theory of real closed fields is complete, and decidable. This means that there exists a general procedure that takes as input an assertion expressed in this theory and decides which of the assertion and its negation is true (complete means that either the assertion or its negation is true). — Wikipedia: unlike natural-number logic, real-closed field logic is decidable
so how can any of that be used to explain or reproduce what the (philo of) human mind does? They tried decades ago to use things like symbolic, predicate calculus/logic but failed to anything useful beyond creating automatic theorem provers. — Sir Philo Sophia
don't often say such-and-such is infinite, rather they say a process tends to infinity — jgill
Extended real number line. In mathematics, the affinely extended real number system is obtained from the real number system ℝ by adding two elements: + ∞ and − ∞ (read as positive infinity and negative infinity respectively), where the infinities are treated as actual numbers.[1] It is useful in describing the algebra on infinities and the various limiting behaviors in calculus and mathematical analysis, especially in the theory of measure and integration.[2] The affinely extended real number system is denoted R ¯ or [−∞, +∞] or ℝ ∪ {−∞, +∞}. — Wikipedia on the affinely extended real number system
It implies that if a countable first-order theory has an infinite model, then for every infinite cardinal number κ it has a model of size κ, and that no first-order theory with an infinite model can have a unique model up to isomorphism. As a consequence, first-order theories are unable to control the cardinality of their infinite models. — Wikipedia on the Löwenheim–Skolem theorem
thanks for sharing that. cute, but not very useful in the relm of the mind. That is, my original statement/assessment still stands re " any property has to convey some kind of unique meaning/utility concerning the object it is a property ", except for trivial utility like concatenating, etc.- no meaning is conveyed/preserved to how is that useful to reasoning or the mind? — Sir Philo Sophia
"The undefinability theorem shows that this encoding cannot be done for semantic concepts such as truth." — Sir Philo Sophia
your idea on that is unclear to me. any property has to convey some kind of unique meaning/utility concerning the object it is a property of. How does a number, alone, impart/convey any meaning? — Sir Philo Sophia
numbers, alone, have no properties. so, your ideas here seem to be incomplete at best, flawed at worst. — Sir Philo Sophia
Gödel noted that statements within a system can be represented by natural numbers. The significance of this was that properties of statements - such as their truth and falsehood - would be equivalent to determining whether their Gödel numbers had certain properties. — Wikipedia on Gödel numbering
Arithmetization. A method used in mathematical logic for replacing a reasoning on the expressions of some logico-mathematical language by reasonings on natural numbers. For this purpose the replacement is constructed by some sufficiently simple one-to-one mapping of the set of all words (in the alphabet of the language under consideration) into the natural number sequence. The image of a word is called its number. Relations between and operations defined on words are transformed by this mapping into relations between and operations on natural numbers. The requirement of a "sufficiently simple" mapping leads to the fact that some basic relations (such as the relation of imbedding of one word into another, etc.) and some operations (like the operation of concatenation of words, etc.) are transformed into relations and operations having a simple algorithmic nature (e.g. are primitive recursive). — Encyclopedia of Mathematics on Arithmetization
In 1931, Kurt Gödel published the incompleteness theorems, which he proved in part by showing how to represent the syntax of formal logic within first-order arithmetic. Each expression of the formal language of arithmetic is assigned a distinct number. This procedure is known variously as Gödel numbering, coding and, more generally, as arithmetization. In particular, various sets of expressions are coded as sets of numbers. It turns out that for various syntactic properties (such as being a formula, being a sentence, etc.), these sets are computable. Moreover, any computable set of numbers can be defined by some arithmetical formula. For example, there are formulas in the language of arithmetic defining the set of codes for arithmetic sentences, and for provable arithmetic sentences. — Wikipedia on the arithmetization of logic in Gödel's work