CONTENTS ix Appendix C. Functional analysis 399 §C.1. Operator theory 399 §C.2. Spectral theory 403 §C.3. Trace class operators 411 Appendix D. Fredholm theory 415 §D.1. Grushin problems 415 §D.2. Fredholm operators 416 §D.3. Meromorphic continuation 418 Bibliography 421 Index 427
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