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Title: Coefficients in bordism
Author: Bunocristiano, Sandro
Awarding Body: University of Warwick
Current Institution: University of Warwick
Date of Award: 1973
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In this paper is given a treatment of coefficients for a vast class of (co)-bordism theories of manifolds with singularities. If h(-) is one of these theories and G is an abelian group we introduce coefficients G into h in such a way that (a) h(-; G) is a functor on the category of all abelian groups; (b) the universal-coefficient sequence is natural on the category of all abelian groups. Consequently, by [5], it is pure and hence, by algebra, it splits for a vast class of abelian groups, including all groups of finite type. (c) If G is an R-module, R any commutative ring with unit, h(-; G) inherits an R-module and h(point; R)-module structure in a natural way. It follows from Dold [3] that there is a generalized universal-coefficient sequence consisting of a spectral sequence running Torp(hq(-;R),G)=>h(-; G). (d) When h(-) = H(-;Z) singular (co)homology with integer coefficients, the definition coincides with the usual one given by means of chain complexes. (e) The method works to introduce local coefficients in the cohomology theory h*(-) ; i.e. if F is any sheaf of modules over a compact polyhedron X, then h*(X; F) is defined and it is a functor on sheaves. (f) If F/x is a 'nice' sheaf (in the sense of III.3), there is a spectral sequence running Hp(X; hqF) => h*(X; F) (*) where hqF is the graded sheaf obtained from F by applying the functor hq(point; -) and H is singular cohomology. When F is constant, (*) reduces to the usual type. A comparison theorem is deduced from (*) by means of the Mapping Theorem between spectral sequences.
Supervisor: Not available Sponsor: Consiglio Nazionale delle Ricerche (Italy)
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: QA Mathematics