quaternionic projective line$\,\mathbb{H}P^1$
homotopy theory, (∞,1)-category theory, homotopy type theory
flavors: stable, equivariant, rational, p-adic, proper, geometric, cohesive, directed…
models: topological, simplicial, localic, …
see also algebraic topology
Introductions
Definitions
Paths and cylinders
Homotopy groups
Basic facts
Theorems
A rational homology sphere is a topological space which need not be homeomorphic to an n-sphere, but which has the same rational homology as an $n$-sphere.
Every homology sphere is a rational homology sphere.
Created on March 21, 2024 at 16:30:20. See the history of this page for a list of all contributions to it.