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2020 | OriginalPaper | Buchkapitel

Tango Structures on Curves in Characteristic 2

verfasst von : Yoshifumi Takeda

Erschienen in: Polynomial Rings and Affine Algebraic Geometry

Verlag: Springer International Publishing

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Abstract

The (pre-)Tango structure is a certain ample invertible sheaf of exact differential 1-forms on a projective algebraic variety and it implies some typical pathological phenomena in positive characteristic. Moreover, by using the notion of (pre-)Tango structure, we can construct another variety accompanied by similar pathological phenomena. In this article, we explicitly show several interesting and mysterious phenomena on the induced uniruled surfaces from (pre-)Tango structures on curves in characteristic 2.

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Fußnoten
1
Here, note the divisibility of the Picard variety.
 
2
Recall the extension \(0\rightarrow \mathcal {O}_C\rightarrow \mathcal {E}\rightarrow \mathcal {N}^n\rightarrow \ 0\), where \(\mathcal E\) is generated locally by 1 and \(q_i\)’s subjected to \(q_i=d^n_{ij}q_j +b_{ij}\) (see Sect. 3).
 
3
Here ‘involving’ means ‘inducing’ or ‘inducing a normal uniruled surface whose desingularization is’.
 
4
The induced uniruled surface is a quasi-elliptic surface of \(\kappa =1\).
 
5
The induced uniruled surface is also a quasi-elliptic surface of \(\kappa =1\).
 
6
For details, see the author’s forthcoming paper.
 
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Metadaten
Titel
Tango Structures on Curves in Characteristic 2
verfasst von
Yoshifumi Takeda
Copyright-Jahr
2020
DOI
https://doi.org/10.1007/978-3-030-42136-6_12

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