which, in quantum mechanics, corresponds to the 
-component of momentum. [P10.4]
is: an operator (i.e. a symbolic instruction to carry out a mathematical operation) that involves the process of differentiation. [M4.3]
usually acts: on whatever is immediately to its right. [M4.3]
is exemplified: by which, in quantum mechanics, corresponds to the -component of momentum. [P10.4]
is also exemplified: by 
which, in quantum mechanics, corresponds to the kinetic energy of a particle moving in one dimension. [P10.4]
See also eigenfunction, eigenvalue and eigenvalue equation.
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