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A projection \(P\) is such that \(P = P^2 = P^*\).
The projection \(P\) on a closed subspace \(M\) is the unique operator such that \(Ph \in M\) and \(h - Ph \perp M\) for all \(h \in \mathcal{H}\).
A projection \(P\) is such that \(P = P^2 = P^*\).
The projection \(P\) on a closed subspace \(M\) is the unique operator such that \(Ph \in M\) and \(h - Ph \perp M\) for all \(h \in \mathcal{H}\).