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Homotopy theory, homological algebra, algebraic treatments of manifolds.

25 votes
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Action of the degree 2 map on $\pi_8(S^4)$

I am currently reading Sullivan's Geometric Topology: Localization, Periodicity, and Galois Symmetry, on page 34 Sullivan claims that the degree 2 map $2:S^4 \to S^4$ induces the map $\left(\begin{sma …
Benjamin Gadoua's user avatar