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Nov 23, 2010 at 13:10 comment added Johannes Ebert That was a typo, $H \sigma^n\bZ=\Sigma^n H\bZ$. The composition is a weak equivalence iff $X^{\mu} \to \Sigma^n H \bZ$ is a Thom class.
Nov 23, 2010 at 13:05 history edited Johannes Ebert CC BY-SA 2.5
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Nov 23, 2010 at 12:27 comment added roger123 This is interesting, Johannes. May I ask what $H\sigma^n\mathbb{Z}$ is and what the map $\Sigma^n H\mathbb{Z}\wedge H\mathbb{Z}\to H\sigma^n\mathbb{Z}$ does? One likes to have a map $f:X^\mu\wedge H\mathbb{Z}\to X_+\wedge \Sigma^n H\mathbb{Z}$ in the end to get the homology isomorphism, right? Do you say that $X^\mu\to \Sigma^n H\mathbb{Z}$ can be defined as a Thom class iff the map $f$ is a weak homotopy equivalence? Thank you.
Nov 21, 2010 at 19:33 vote accept skupers
Nov 21, 2010 at 16:32 history edited Charles Rezk CC BY-SA 2.5
Tex fix
Nov 21, 2010 at 10:50 history answered Johannes Ebert CC BY-SA 2.5