Physics, Quantum Physics, Quantum Mechanics, Quantum, Mathematics.
that this time we have the bra of Ψ, ⟨Ψ|, and the ket of Ψ, |Ψ⟩. We can then have the operator Q hat act on the ket |Ψ⟩, and then take the ‘matrix product’ between ⟨Ψ| and the resulting function. Notice that this time we made no reference to an inner product at all. Additionally, we can see how