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Submission: 2013, Jul 23
We give a simple formula for the essential dimension of a pseudo-reflection group at a prime p. Additionally, we determine the absolute essential dimension in most cases. We also study the ``poor man's essential dimension" of an arbitrary finite group, an intermediate notion between the absolute essential dimension and the essential dimension at a given prime.
2010 Mathematics Subject Classification: 20F55, 20D15
Keywords and Phrases: Essential dimension, pseudo-reflection group, p-group
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