absolute homotopy group的用法和样例：
- Homotopy Group in Fuzzy Topological space
- Some acquaintance with manifolds, simplicial complexes, singular homology and cohomology, and homotopy groups is helpful, but not really necessary.
- Stable homotopy groups of spheres
- That hill's an absolute doddle (to climb).
- We now have the absolute proof of his guilt.