Finite permutation groups that act with fixity 4
Barbara Baumeister, Paula Hähndel, Kay Magaard, Christoph Möller, Rebecca Waldecker
Abstract
Motivated by the theory of Riemann surfaces and specifically the significance of Weierstrass points, we prove general structure results about finite groups that have a faithful transitive action with fixity 4. We also explain examples for many different possibilities of such actions.
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