fluidistic
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Consider a system of 2 identical electrons that are confined in a region so that there is a single wavefunction describing the whole system. In several textbooks one can read that the probability to measure the position of an electron in region near ##r_1## and the other in a region near ##r_2## as ##|\Psi(r_1, r_2, t)|^2dV_1dV_2##. However I have never, ever seen written the probability of measuring the position of only one of those electrons. Is it because it is impossible to make a measurement on a single of these electrons? If not, then how would I write down the probability to measure of one these electrons near ##r_1## but without measuring the position of the other electron?