Perturbations of the Dirac operator. (English) Zbl 0245.35070

Conf. Theory ordinary partial diff. Equ., Dundee/Scotland 1972, Lect. Notes Math. 280, 87-102 (1972).


35R20 Operator partial differential equations (= PDEs on finite-dimensional spaces for abstract space valued functions)
47F05 General theory of partial differential operators
35P99 Spectral theory and eigenvalue problems for partial differential equations