Columbia subject headings:
Invariants.
Stratified sets.
Topological manifolds.
Topological spaces.
Harvard subject headings:
Algebraic topology.
Invariants.
Mathematics.
Stratified sets.
Topological manifolds.
Topological spaces.
Topology.
Princeton subject headings:
Invariants.
Stratified sets.
Topological manifolds.
Topological spaces.