Whitehead torsion II (Ex)

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Let f \colon X \to Y be a homotopy equivalence of finite CW complexes. Show that f \times \text{id}_{S^1} \colon X \times S^1 \to Y \times S^1 is a simple homotopy equivalence.

This is [Kreck&Lück2005, Ex 6.2].

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