bra-ket

English

Etymology

Concatenation of the terms bra and ket, which were introduced in 1939[1] and in turn derive from the splitting of the English word bracket.

Noun

bra-ket (plural bra-kets)

  1. (physics) The scalar product of two vectors (and optionally an operator), in Hilbert space, where the left (row) vector is a bra and the right (column) vector is a ket. Symbolised by ⟨...|...⟩ (bra and ket only) or ⟨...|...|...⟩ (bra, operator, ket).

References
  1. Dirac, P. A. M. (1939) “A new notation for quantum mechanics”, in Mathematical Proceedings of the Cambridge Philosophical Society‎, volume 35, number 3, →Bibcode, →DOI, pages 416–418

Anagrams
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