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A finite field is a field with a finite number of elements. For each prime power $q^k$, there is a unique (up to isomorphism) finite field with $q^k$ elements. Up to isomorphism, these are the only finite fields.

25 votes
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How does Tate verify his own conjecture for the Fermat hypersurface?

I don't know how Tate did it but here is one way. Let $\zeta$ be such that $\zeta^{q+1}=-1$ and put $a_j=(0\colon\cdots\colon1\colon\zeta:\cdots\colon0)$, $j=0,\ldots,i$ with the $1$ in coordinate $2 …
Torsten Ekedahl's user avatar
1 vote

A family of hypersurfaces with many points

This is very far from a solution but just some ideas that could be possibly be used as a start. First a simple observation on an Artin-Schreier type extension $X\rightarrow Y$, where $X:=\mathrm{Spec …
Torsten Ekedahl's user avatar