Physics, Quantum Physics, Quantum Mechanics, Quantum, Mathematics.
Image Source: Nobel Foundation Bras and Kets How Dirac notation works is by splitting up the inner product between two vectors, ⟨f | g⟩, into two separate objects, ⟨f | and | g⟩. The object on the left is known as a ‘bra’ and the right is a ‘ket’ (and yes, these names come from splitting up the