The Ξ operator and its relation to Krein's spectral shift function

Introduction to the Theory of Linear Non-selfadjoint Operators

Israel Gohberg · Medical Entomology and Zoology · 1969 · 1.5K citations

Linear Non-selfadjoint Operators, Linear Operator, Resolvent Kernel +1

Wave operators and similarity for some non-selfadjoint operators

Tosio Kato · Mathematische Annalen · 1966 · 463 citations

Wave Operators, Linear Operator, Resolvent Kernel +1

ON THE BOUND STATES OF A GIVEN POTENTIAL

Julian Schwinger · Proceedings of the National Academy of Sciences · 1961 · 295 citations

Riemann-hilbert Problem, Potential Theory, A Given Potential +2

The Index of a Pair of Projections

J. E. Avron, R. Seiler, Barry Simon · Journal of Functional Analysis · 1994 · 248 citations

Index System, Projection System, Indexing Technique

On exponential representations of analytic functions in the upper half-plane with positive imaginary part

N. Aronszajn, William F. Donoghue · Journal d Analyse Mathématique · 1956 · 152 citations · Full text

Representation Theory, Potential Theory, Exponential Representations +6