I am doing a quantum mechanics question involving the positivity of the norm. So I'm using the fact that the norm will be greater than zero but i want to apply an operator onto the ket on one side of the equation, is it a legal operation to apply the operator to the zero on the other side and say its still zero?
2026-03-30 16:25:11.1774887911
Applying an operator on both sides of an equation
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