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<math> a^{\dagger}_{\alpha} a_{\beta } | \phi_1 \cdots \phi_N \rangle = \sum_k \langle \beta | \phi_k \rangle | \phi_1 \cdots \phi_{k-1} \alpha \cdots \phi_N \rangle </math> | <math> a^{\dagger}_{\alpha} a_{\beta } | \phi_1 \cdots \phi_N \rangle = \sum_k \langle \beta | \phi_k \rangle | \phi_1 \cdots \phi_{k-1} \alpha \cdots \phi_N \rangle </math> | ||
Act of <math> a^{\dagger } </math> | |||