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Outer Products in Matrix Notation

Prompt

Write the outer product $\vert + \rangle\langle + \vert$ in matrix notation.

Write the sum of outer products $\vert + \rangle\langle + \vert \ + \ \vert - \rangle\langle - \vert$ in matrix notation.

Context

This SWBQ

Based on a Colorado Clicker Question.

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