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A (Covariant) 1-Vector denoted $\left\langle\psi\right\vert$. The bra is Dual to the Contravariant Ket, denoted $\left\vert\psi\right\rangle$. Taken together, the bra and Ket form an Angle Bracket (bra+ket = bracket). The bra is commonly encountered in quantum mechanics.

See also Angle Bracket, Bracket Product, Covariant Vector, Differential k-Form, Ket, One-Form

© 1996-9 Eric W. Weisstein