# Answer to Question #60874 in Other Physics for Kavya Singh

Question #60874

The eigenvalues and eigenfunctions of a quantum mechanical operator A are denoted

by an and , ψn

respectively.

If f(x) denotes a function that can be expanded in the powers of x, show that:

f ( A)ψn = f (an )ψn

by an and , ψn

respectively.

If f(x) denotes a function that can be expanded in the powers of x, show that:

f ( A)ψn = f (an )ψn

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