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Multiple choice
In Dirac notation, the outer product
∣
ψ
⟩
⟨
ϕ
∣
|\psi\rangle\langle\phi|
∣
ψ
⟩
⟨
ϕ
∣
produces what kind of object?
A column vector (a ket)
A matrix (an operator)
A row vector (a bra)
A scalar (a complex number)
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