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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

Enriques surfaces over $\mathbb Z$

A preprint by Stefan Schröer came out today with the answer to this question: arXiv:2004.07025. No such Enriques surface exists. In fact, there is no classical Enriques surface over $\mathbb F_2$ wit …
Will Sawin's user avatar
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3 votes
0 answers
97 views

Supremum of certain modified zeta functions at 1

Let $D$ be an integer number and let $\chi$ be the Dirichlet character defined by $$\chi(m) = 0 \text{ if $m$ even, } \chi(m) = (D/m) \text{ if $m$ odd,}$$ where $(D/m)$ denotes the Jacobi symbol. Le …
1 vote

Easiest way to distinguish $E_8 \oplus E_8$ from $E_{16}$

In sage, you can use the command .is_globally_equivalent_to(), which allows you to compare two quadratic forms. See the Quadratic Forms Overview.
Davide Cesare Veniani's user avatar
2 votes
Accepted

A question regarding lines on a cubic surface

To each automorphism of the binary form there correspond actually $d$ lines, not only one. In case $d = 3$, since there are always 6 automorphisms, we get $6\cdot 3 = 18$ lines, which summed to the 9 …
Davide Cesare Veniani's user avatar