e^{+} + e^{-} \to 2 γ

${e^+ + e^- \rightarrow 2 \gamma}$

e^{+} + e^{-} \to 2 γ

$e^+ + e^- \rightarrow 2 \gamma$

\to

$\rightarrow$

\to

$\rightarrow$

1

γ

$\gamma$

1

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