The combination of a Bra and Ket (bra+ket = bracket) which represents the Inner Product
of two functions or vectors,
By itself, the Bra is a Covariant 1-Vector, and the Ket is a
Covariant One-Form. These terms are commonly used in
quantum mechanics.
See also Bra, Differential k-Form, Ket, One-Form
© 1996-9 Eric W. Weisstein
1999-05-25