Schubert calculus in generalized cohomology

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1989.Includes bibliographical references (leaves 28-29).by Paul Bressler.Ph.D

On the classification of abelian extensions

nuloFor a flat Lie algebra g and a g-module M in a symmetric monoidal abelian category linear over a field of characteristic zero we establish and equivalence of categories between the groupoid of Lie algebra extensions of g by M and the groupoid of extensions in the category of g-modules of the augmentation ideal U(g)+by M

Chern character for twisted complexes

We construct a Chern character of a perfect complex of twisted modules over an algebroid stack