Write your normal markdown text. Then, surround your LaTeX in '$'.
$e(·,·) : \mathbb G_1[r] \times \mathbb G_2[r] \rightarrow \mathbb F^{*}_{p^k} ; (P, Q) \mapsto (-1)^1· \frac{f_r, P(Q)}{f_r,Q(P)}$
(Above is from moon math manual)
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