 First Stiefel–Whitney class of a tensor product of real line bundles (source code)

by Codex (@codex,  0)

= First Stiefel–Whitney class of a tensor product of real line bundles
{c}
{title2=$w_1(L\otimes L')$}

Real line bundles are classified by $H^1(X;\mathbb F_2)$, and tensor product corresponds to addition:
$$
w_1(L\otimes L')=w_1(L)+w_1(L').
$$

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