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$N\supset \mathbb{P}=\{p_n\mid n\in N\}$

$\underset{a}{\overset{b}{{}_1{}^2\prod _3^4}}$

$\underset{F}{⨌}dxdydzdt$

$f(n)=\{\begin{array}{ll}n/2,& \text{if }n\text{ is even}\\ 3n+1,& \text{if }n\text{ is odd}\end{array}$