Comparing homologies: Čech's theory, singular chains, integral flat chains and integral currents

Fima, Pierre

doi:10.4171/RMI/489

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Revista Matemática Iberoamericana

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Volume 23, Issue 1, 2007, pp. 143–189

DOI: 10.4171/RMI/489

Published online: 2007-04-30

Comparing homologies: Čech's theory, singular chains, integral flat chains and integral currents

Pierre Fima^[1]

(1) Université Denis Diderot (Paris 7), France

We give a new proof of a Theorem of S. Mardešić, generalized by G. E. Bredon, that Čech and singular homology groups of certain locally connected spaces coincide. We use the chain complexes of integral flat chains (H. Whitney) and integral currents (H. Federer and W. H. Fleming) to define new homology groups of subsets of Euclidean space. We show these verify the axioms of Eilenberg and Steenrod, and we provide Lipschitz-flavored local connectedness conditions which guarantee these groups coincide with Čech's. Relations between these theories is relevant for the solvability and regularity of many geometric variational problems.

Keywords: Čech homology, singular homology, locally connected spaces, integral flat chains, integral currents

Fima Pierre: Comparing homologies: Čech's theory, singular chains, integral flat chains and integral currents. Rev. Mat. Iberoam. 23 (2007), 143-189. doi: 10.4171/RMI/489