The homotopy classification and the index of boundary value problems for general elliptic operators
arXiv:math/9911055
Abstract
We give the homotopy classification and compute the index of boundary value problems for elliptic equations. The classical case of operators that satisfy the Atiyah-Bott condition is studied first. We also consider the general case of boundary value problems for operators that do not necessarily satisfy the Atiyah-Bott condition.
27 pages, 1 figure