- #1

nmsurobert

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## Homework Statement

Let the Hermitian operator A^ corresponding to the observable A have two eigenstates |a1> and |a2> with eigenvalues a1 and a2, respectively, where a1 ≠ a2. Show that A^ can be written in the form A^ = a1|a1><a1| + a2|a2><a2|.

## Homework Equations

## The Attempt at a Solution

I reached out the instructor for some guidance but I am still confused.

To my understanding i should start with A^|ψ>. Where |ψ> is some arbitrary spin state.

and i don't know where to go from there.