Formal correspondence between two commutator problems in QM

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(for *mobile* users) 00:18 How to change from quantum linear to angular momentum 02:20 Commutator problems side by side, using dummy function 04:38 Evaluating operators 06:37 Using product rule for differentiation 08:21 Showing that commutator not equal to zero, so operators do not commute, so that Uncertainty Principle applies