A Riemann-Hurwitz formula for hypermaps congruences (Q1825882)
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scientific article; zbMATH DE number 4122028
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | A Riemann-Hurwitz formula for hypermaps congruences |
scientific article; zbMATH DE number 4122028 |
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A Riemann-Hurwitz formula for hypermaps congruences (English)
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1989
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The author derives an equation relating the genus of a hypermap H to that of the quotient H/R where R is a congruence. The particular case where R is pseudoregular implies a formula of \textit{A. Machi} [Arch. Math. 42, 280-288 (1984; Zbl 0522.20003)] connecting the genus of H to that of H/A where A is an automorphism group.
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genus
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hypermap
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automorphism group
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