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Hasse-Witt and Cartier-Manin matrices: a warning and a request. (English) Zbl 1439.11145

Aubry, Yves (ed.) et al., Arithmetic geometry: computation and applications. 16th international conference on arithmetic, geometry, cryptography, and coding theory, AGC2T, CIRM, Marseille, France, June 19–23, 2017. Proceedings. Providence, RI: American Mathematical Society (AMS). Contemp. Math. 722, 1-18 (2019).
Summary: Let \(X\) be a curve in positive characteristic. A Hasse-Witt matrix for \(X\) is a matrix that represents the action of the Frobenius operator on the cohomology group \(H^1(X,\mathcal{O}_X)\) with respect to some basis. A Cartier-Manin matrix for \(X\) is a matrix that represents the action of the Cartier operator on the space of holomorphic differentials of \(X\) with respect to some basis. The operators that these matrices represent are adjoint to one another, so Hasse-Witt matrices and Cartier-Manin matrices are related to one another, but there seems to be a fair amount of confusion in the literature about the exact nature of this relationship. This confusion arises from differences in terminology, from differing conventions about whether matrices act on the left or on the right, and from misunderstandings about the proper formulæ for iterating semilinear operators. Unfortunately, this confusion has led to the publication of incorrect results. In this paper we present the issues involved as clearly as we can, and we look through the literature to see where there may be problems. We encourage future authors to clearly distinguish between Hasse-Witt and Cartier-Manin matrices, in the hope that further errors can be avoided.
For the entire collection see [Zbl 1410.11003].

MSC:

11G20 Curves over finite and local fields
14Q05 Computational aspects of algebraic curves
14G10 Zeta functions and related questions in algebraic geometry (e.g., Birch-Swinnerton-Dyer conjecture)
14G15 Finite ground fields in algebraic geometry
14G17 Positive characteristic ground fields in algebraic geometry
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References:

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