Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9516794 | Topology and its Applications | 2005 | 14 Pages |
Abstract
Let X be a Peano continuum. Then the following hold: (1) The singular cohomology group H1(X) is isomorphic to the Äech cohomology group HË1(X). (2) For each homomorphism h:Ï1(X)â*iâIGi there exists a finite subset F of I such that Im(h)â*iâFGi. (3) For each injective homomorphism h:Ï1(X)âG0*G1 there exists a finitely generated subgroup F0 of G0 or a finitely generated subgroup F1 of G1 such that Im(h)âF0*G1 or Im(h)âG0*F1.
Related Topics
Physical Sciences and Engineering
Mathematics
Geometry and Topology
Authors
Katsuya Eda,