On ring-valued invariants of topological pairs

Abstract

Based on the notion of a $\Delta$-group(oid), ring-valued invariants of pairs of topological spaces can be defined in intrinsic topological terms.

5 pages, no figures, Theorem 1 has been removed, some corrections added

Cited by in corpus (2)

• On malnormal peripheral subgroups in fundamental groups of 3-manifolds
• Delta-groupoids in knot theory