‎"BETHE, H. A. & E. E. SALPETER.‎
‎Relativistic Equation for Bound-State Problems. - [THE BETHE-SALPETER EQUATION]‎

‎Lancaster, American Institute of Physics, 1951. Lex8vo. Volume 84, December 15, No. 6, 1951 of ""The Physical Review"", Second Series. Entire volume offered in the original printed blue wrappers. Previous owner's stamp to front wrapper. Minor wear to extremities and a bit of discolouring to spine and extremities. Front wrapper with light tie-markings after having been bundled and tied. Fine and clean. Pp. 1232-1242. [Entire issue: Pp. 1079-1286, iii-x].‎

Reference : 43546

‎First publication of the influential and groundbreaking description (the detailed description including the derivation) of the Bethe-Salpeter equation. Due to its generality, it has been used in nearly all branches of theoretical physics and has been presented in many different forms. In general, the theory describes the bound states of a two-body quantum field theoretical system in a relativistically covariant formalism. In Early 1951, Bethe and Salpeter published a paper in which they introduced the concept of the Bethe-Salpeter equation but had not made the final calculations and derivations. This paper presents the theory including the derivation and is therefore known as the first documented publication of the theory. ‎