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

15 votes
Accepted

integer solutions to quadratic forms

Here is the standard geometric argument: after extracting common factors, you are asking for rational points on the quadric $Q\colon x^2-w^2=z^2-y^2$ in $\mathbb{P}^3$, which is isomorphic to $\mathbb …
Tony Scholl's user avatar
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8 votes
Accepted

Mod l local Galois representations (l different from p)

The image of wild inertia is a finite $p$-group, and if $d$ is the degree of an irreducible representation of a $p$-group over an algebraically closed field of characteristic $\ne p$, then $d$ is a po …
Tony Scholl's user avatar
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13 votes

L'un des problèmes fondamentaux de la théorie des nombres

Although this isn't at the moment heading towards the Riemann hypothesis, the most promising line of research in this area seems to be Lichtenbaum's Weil-etale cohomology. In the 1951 paper you cite, …
Tony Scholl's user avatar
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22 votes

who fixed the topology on ideles?

They are too old for Math Reviews, but I think the articles in question are: Von Neumann: "Zur Prüferischen Theorie der idealen Zahlen", Acta Scientiarum Mathematicum (Szeged) 2:4 (1926) (can be rea …
Tony Scholl's user avatar
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29 votes
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Cusp forms and L^2

This is a long answer because the question asks quite a lot of things. I agree that Gelbart's book, although inspirational, is hard for someone without a strong analytic background. The Boulder and Co …
Tony Scholl's user avatar
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12 votes

Two questions about finiteness of ideal classes in abstract number rings

Here is an answer to your "question 0" - an example of an "exotic" number ring. (This should be a comment but it is too long.) Construct a sequence of number rings $\mathbb{Z}=R_0\subset R_1\subset …
Tony Scholl's user avatar
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