A matrix identity and perturbation expressions

Autor:	K. L. Sebastian, S. K. Rangarajan
Rok vydání:	1978
Předmět:	Electronic correlation Chemistry Diagonal Biophysics Identity matrix Perturbation (astronomy) Inverse Condensed Matter Physics Formalism (philosophy of mathematics) Quantum mechanics Physical and Theoretical Chemistry Molecular Biology Harmonic oscillator Mathematical physics
Zdroj:	Molecular Physics. 36:343-353
ISSN:	1362-3028 0026-8976
DOI:	10.1080/00268977800101611
Popis:	An identity expressing formally the diagonal and off-diagonal elements of an inverse of a matrix is deduced employing operator techniques. Several well-known perturbation expressions for the self-energy are deduced as special cases. A new approximation and other applications following from the above formalism are briefly indicated through illustrations from a perturbed harmonic oscillator, chemisorption approximations and Kelly's result in the problem of electron correlation.
Databáze:	OpenAIRE
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