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 product of two vectors (and optionally an operator), in Hilbert space, where the left vector is a bra and the right 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, issue 3, Bibcode: 1939PCPS...35..416D, DOI:10.1017/S0305004100021162, pages 416–418

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