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Suppose we have an inclusion of a closed sub-Lie group $H\to G$ and take the space of left cosets of $H$, $G/H$. How is this related to the homotopy cofiber of the inclusion of topological spaces $cof(\iota:H\to G)$, i.e. "coning off" $H$ in $G$. Are they homotopy equivalent?

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You could try look in Mimura-Toda and see if they talk about anything like this –  Juan S Feb 6 '13 at 1:26

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up vote 3 down vote accepted

I think the following is a counterexample. Consider $H:= \{\pm 1\}\subset G:= U(1)$. Then $G/H = RP^1$, whereas the cone on the inclusion is homotopy equivalent to $S^1\vee S^1$.

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