Question
Show that }(\boldsymbol{\sigma} \cdot \mathbf{p})^{2}=|\mathbf{p}|^{2}
Step 1
Now, let's consider the dot product of the Pauli matrices σ with the momentum vector p: σ · p = σ_x p_x + σ_y p_y + σ_z p_z where σ_x, σ_y, and σ_z are the Pauli matrices and p_x, p_y, and p_z are the components of the momentum vector p. Now, let's square this Show more…
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