Beschreibung:

SCHRÖDINGER, Erwin. Further Studies on Solving Eigenvalue Problems by Factorization . 1941. -- Exchange and Spin. The Factorization of the Hyper-Geometric Equation . 1941. -- Irreversibility . 1950. Offprints from: Proceedings of the Royal Irish Academy , Volume 46, Number 14; Volume 47, Numbers 3 and 4; Volume 53, Number 12, all Section A. Dublin: Hodges Figgis & Co, 1941, 1950. Together 3 offprints, 8 o. Original printed wrappers (second offprint separated from wrappers, short edge tear to first). Provenance : National Academy of Sciences Library, National Research Council (ink stamp on front wrapper of third offprint). There are two manuscript corrections, in the first offprint correcting a variable on page 185 and in the second correcting "Edwin" to "Erwin" on front wrapper. FIRST EDITIONS, offprint issues. The present papers treat his factorization method, the identity relation between the operators of exchange and spin, and irreversibility. (3)