Thursday, 16 August 2007

model categories - Equivariant map preserves stabilizer

Let G be a group and X a set equipped with a transitive right G-action. Further, let c:XtoX be a G-equivariant map. Is it true that textStab(x)=textStab(c(x)) for all xinX?



This doesn't seem to be an interesting mathoverflow question on its own, but the reason I ask is the following: In Hovey's book on Model Categories Hovey proves some sort of five lemma for pointed model categories (Thm.6.5.3). In the end of the proof, he seems to conclude from alphatextStab(x)alpha1subsettextStab(x) that equality holds; I don't understand how this can be done. The above statement comes from a try to fix this gap.

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