Gebhard Martin

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20242026

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math.AG2026

Enriques' characterization of Abelian surfaces in positive characteristic

Jefferson Baudin, Gebhard Martin

Extending Enriques' characterization to algebraically closed fields of characteristic $p \geq 7$ , we show that every smooth projective surface $X$ with $h^{1} (X, O_{X}) = 2$ …

math.NT2026

On symmetries of hyperbolic lattices of large rank

Torben Grabbel, Gebhard Martin, Giacomo Mezzedimi +2

For an even, integral hyperbolic lattice $L$ , the symmetry group of $L$ is the quotient of the group of isometries of $L$ by the Weyl subgroup of $(- 2)$ -reflections. Following Niku…