# Quantum Mechanics postulate

by PAPquestions
Tags: mechanics, postulate, quantum
 P: 2 Hi I am new here and also new to QM. I have encountered a problem about postulate 2 which is the superposition principle. Basically I understand the concept. However, when it comes to real question, I get stuck and can't proceed. Could anyone enlightens me how to get started with the problem below? Question: A psi(x) = [psi(x)]^2 Is A a linear operator? Is A a Hermitian?
 P: 2 Heh, I found the way to solve it already!
 P: 1,412 BTW: You should start using the notation $$(A\psi )(x)$$ instead of $$A\,\psi(x)$$. It will help you to understand better the mathematical operations involved. $$(A\psi )(x)$$ reads: the value of the function $$A\psi$$ at the point x. Operators act on functions (as objects) and not on values of these functions (numbers).

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