Talk:Whitehead torsion II (Ex)

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Using the product formula \tau(f \times f') = \chi(X') \left( i_* \left(\tau(f)\right)\right) + \chi(X) \left({i'}_*\left( \tau(f') \right)\right), where f:X \rightarrow Y, f': X' \rightarrow Y' are homotopy equivalences and i: Y \rightarrow Y \times Y', i': Y' \rightarrow Y \times Y' are induced by choosing basepoints, this is trivial since \chi(S^1) = 0, \tau(\id_{S^1}) = 0.

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