Adv. Geom., 2013, Volume 13, Issue 3, Pages 389–418
G-Fano threefolds, I
Department of Algebra, Faculty of Mathematics, Moscow State University, Moscow, 119 991, Russia
We classify Fano threefolds with only terminal singularities whose canonical class is Cartier and divisible by 2 with the additional assumption that the G-invariant part of the Weil divisor class group is of rank 1 with respect to an action of some group G. In particular, we find a lot of examples of Fano 3-folds with “many” symmetries.
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