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Multiple choice
For a projector P (an orthogonal projector) used in a projection-valued measure, which pair of defining properties holds?
P^2 = -P and trace(P) = 0
P^dagger P = I and det(P) = 1 (unitary)
P = P^dagger and P^2 = P (Hermitian and idempotent)
P = -P^dagger (anti-Hermitian)
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