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Algebraic varieties, stacks, sheaves, schemes, moduli spaces, complex geometry, quantum cohomology.

22 votes
5 answers
4k views

Why are noetherian rings such natural objects in algebraic geometry?

I assume it is partially because they are good generalizations of polynomial rings, but what makes this generalization better than graded algebras or other generalizations of polynomial rings?
18 votes
4 answers
4k views

Why are topological ideas so important in arithmetic?

For example, Wikipedia states that etale cohomology was "introduced by Grothendieck in order to prove the Weil conjectures". Why are cohomologies and other topological ideas so helpful in understandin …
1 vote
0 answers
773 views

Why is continuity so crucial in arithmetic/algebraic geometry? [closed]

I'm interested in the arithmetic/diophantine equation applications of arithmetic/algebraic geometry. From what I understand, many of the difficult/technical aspects of the latter theories (sheaves, co …
9 votes
1 answer
2k views

Reference request for a proof of Ramanujan's tau conjecture

In the Wikipedia article it states that Ramanujan's tau conjecture was shown to be a consequence of Riemann's hypothesis for varieties over finite fields by the efforts of Michio Kuga, Mikio Sato, Gor …
17 votes
3 answers
4k views

Dwork's use of p-adic analysis in algebraic geometry

Using p-adic analysis, Dwork was the first to prove the rationality of the zeta function of a variety over a finite field. From what I have seen, in algebraic geometry, this method is not used much an …
6 votes
1 answer
631 views

Can algebraic number fields be generalized in a similar way to function fields in 1 variable...

Global fields consist of finite extensions of $\mathbb{Q}$ (algebraic number fields) and finite extensions of $\mathbb{F}_q(x)$ (function fields in 1 variable over a finite field). The latter are isom …