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

56 votes
5 answers
9k views

How do we know that Fermat wrote his famous note in 1637?

It is widely stated that Fermat wrote his famous note on sums of powers ("Fermat's last theorem") in, or around, 1637. How do we know the date, if the note was only discovered after his death, in 1665 …
Angelo's user avatar
  • 27k
10 votes
Accepted

Subgroups of algebraic groups

The functor of injective homomorphisms from $H$ to $G$ is represented by a scheme of finite type over $\mathbb Z$ (a locally closed subscheme of the product $G^H$). If this has points over $\overline{ …
Angelo's user avatar
  • 27k
1 vote

The sum of same powers of all matrices modulo p

My answer was nonsense, sorry.
Angelo's user avatar
  • 27k
17 votes

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

I guess that the title is meant to be provocative: can anyone really believe that number theory is all of mathematics? "Number theory is all of mathematics" is equally false as "Category theory is all …
5 votes

Analytical predicate for integers over complex numbers

Given any set $S$ of complex numbers without accumulation points, you can find an entire function with $S$ as its set of zeroes (this is known as Weierstrass's theorem). So the answer to your question …
Angelo's user avatar
  • 27k
8 votes
Accepted

A criterion for freeness over a local ring

No, this is false as soon as $n ≥ 3$. A second syzygy $M$ of the residue field $K$ gives a counterexample: each $M[1/X_i]$ is projective, hence free, and it is reflexive, so the second condition is sa …
Angelo's user avatar
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