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Prime numbers, diophantine equations, diophantine approximations, analytic or algebraic number theory, arithmetic geometry, Galois theory, transcendental number theory, continued fractions

34 votes

Does anyone know a polynomial whose lack of roots can't be proved?

Something close to what you want is in the paper "Universal Diophantine Equation" by James P. Jones in the Journal of Symbolic Logic 47 (1982), pp. 549--571. Jones produces an explicit list of 37 eq …
John Stillwell's user avatar
9 votes

Meaning of Kronecker's comment to Lindemann

I don't have a good answer to this question, in fact I don't think there is a good answer, because Kronecker did not always oppose the use of irrational numbers. For example, in his 1863 paper "Über d …
John Stillwell's user avatar
17 votes

What was the relative importance of FLT vs. higher reciprocity laws in Kummer's invention of...

Franz Lemmermeyer is better qualified than I am to answer this question, and he certainly knows all about Kummer's motivation from reciprocity laws. However, to answer some parts of your question: Ku …
John Stillwell's user avatar
10 votes

What is the high-concept explanation on why real numbers are useful in number theory?

A possible candidate for a "minimal" result about integers that is a "projection" of a result about reals: the group structure of the solutions of the Pell equation $x^2-dy^2=1$ for $d$ a nonsquare po …
16 votes

Why are topological ideas so important in arithmetic?

May I suggest that we don't have to consider cohomology to see the influence of topology on arithmetic? Looking for rational points on curves leads to the question of which curves have rational parame …
John Stillwell's user avatar
19 votes
8 answers
6k views

To what extent is it true that "number theory = mathematics"? [closed]

In a thought-provoking answer to this MO question, Kevin Buzzard and several commentators have described a multitude of ways in which number theory is related to other parts of mathematics. It seems t …
15 votes

Fermat numbers and the infinitude of primes

It's interesting that the coprimality of Fermat numbers was already known in Goldbach's time. The reason for attributing the proof to Polya is presumably that such a proof is indicated as an exercise …
John Stillwell's user avatar
20 votes

Knuth's intuition that Goldbach might be unprovable

There are also some concrete examples in graph theory, such as Kruskal's tree theorem and the Robertson-Seymour graph minor theorem. These theorems about infinite sequences of graphs were actually pro …
John Stillwell's user avatar
54 votes
Accepted

New proofs to major theorems leading to new insights and results?

Here are a few examples from the 19th century. Unsolvability of the quintic equation. Abel (1826) proved this by algebraic ingenuity, but without clarifying the concepts involved. Galois (1830) gave …