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

55 votes
Accepted

On the series 1/2 + 1/3 + 1/5 + 1/7 + 1/11 + ...

Yes, it's possible. Define the closed sets to be the sets the sum of whose reciprocals converges, together with $\mathbb{N}$. This collection of subsets is closed under arbitrary intersection and fi …
Hugh Thomas's user avatar
  • 6,302
7 votes

Finitely many arithmetic progressions

This is "the same" as the generating function proof, but it doesn't use generating functions explicitly. Take the largest common difference in any of the sequences, say n, and pick $\zeta$ a primitiv …
Hugh Thomas's user avatar
  • 6,302
1 vote

What can be said about number-theoretic properties of the solid angle measures of polytopal ...

$S_n$ acts on the set of cones, and preserves the solid angle measure. If you consider the $n!$ rotations of the cone by elements of $S_n$, and except on the union of some hyperplanes, the number of …
Hugh Thomas's user avatar
  • 6,302
5 votes
Accepted

Counting lattice points inside a parallelepiped

I have not filled in absolutely all the details, but hopefully this is enough to be convincing. Let's let $M$ take positive integer values, and let's consider the parallelepiped: $$P'=\{x+Mtv\mid x\in …
Hugh Thomas's user avatar
  • 6,302