Quantum Physics II, Lecture Notes 9 - MIT OpenCourseWare
In quantum mechanics the classical vectors lr, pl and Ll. become operators. More precisely, they give us triplets of operators: lr → (ˆx, y,ˆ zˆ), lp → ( ˆpx ,pˆy ,pˆz ), (1.3) Ll → (L. ˆ. x ,Lˆy ,Lˆz ). When we want more uniform notation, instead of x, y, and z labels we use 1, 2 and 3 labels:
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