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)alpha−1subsettextStab(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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