HIGHLIGHTS
- who: from the to (Y, X)The vertical maps are constructed by cap-product with the fundamental class of X. In the case that X and Y are manifolds, this homomorphism between (3) and (4) reduces to an isomorphism (cf., .8), from which Leray-Norget's theory of residues can be deduced (cf., .9). In the general case, only the splitting of the homomorphism at the, level can be asserted. The explicit construction of the homomorphism between diagrams (3) and (4) is given in the first sections of the paper. Most of the material in these sections . . .

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