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New posts in obstruction-theory
Showing that the Hopf fibration is a non-trivial fibre bundle
differential-geometry
fiber-bundles
group-cohomology
hopf-fibration
obstruction-theory
When does a continuous map $f:X\rightarrow \mathbb{H}P^n$ lift to $S^{4n+3}$?
algebraic-topology
obstruction-theory
If $S^1 \hookrightarrow X$ induces an injection of $H_1$, then $X$ retracts onto $S^1$
algebraic-topology
obstruction-theory
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