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pro vyhledávání: '"SMITH, Karen"'
We prove that a smooth projective surface of degree $d$ in $\mathbb P^3$ contains at most $d^2(d^2-3d+3)$ lines. We characterize the surfaces containing exactly $d^2(d^2-3d+3)$ lines: these occur only in prime characterize $p$ and, up to choice of pr
Externí odkaz:
http://arxiv.org/abs/2406.15868
Autor:
Mukhopadhyay, Alapan, Smith, Karen E.
Let $k$ be an arbitrary field. We construct examples of regular local $k$-algebras $R$ (of positive dimension) for which the ring of differential operators $D_k(R)$ is trivial in the sense that it contains {\it no} operators of positive order. The ex
Externí odkaz:
http://arxiv.org/abs/2404.09184