Essential Dimensions of A_7 and S_7

Details Essential Dimensions of A_7 and S_7 Essential Dimensions of A_7 and S_7

2009-08-22

arxiv.org/abs/0908.3220v1

Math. Res. Lett. 17 (2010), no. 2, 263-266

Mathematics

Algebraic Geometry

5 pages

Scientific paper

We show that Y. Prokhorov's "Simple Finite Subgroups of the Cremona Group of
Rank 3" implies that, over any field of characteristic 0, the essential
dimensions of the alternating group, A_7, and the symmetric group, S_7, are 4.

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