f1, f2, f3, and f4 are eigenfunctions of the operator A, with corresponding eigenvalues c1, c2, C3, and c4 The system is described by the normalised wavefunction (4): 1 Y = f1 – if2 + 3f3 +fA Determine the outcome of measuring the observable (Y|A|Y) Assume that the eigenfunctions f1, f2, f3, and f4, are orthogonal and normalised.
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