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Adenin
\purinev{4==NH$\mathrm{_2}$;6==H;2==H;1==H}
x^{4}+y^{4}=z^{4}
\left\{ \begin{array}{rcrcr}
2x &   & 5y & = & -3 \\
3x &   & y & = & 2
\end{array} \right.
A=\sqrt{B C}
{\lambda \choose n}=\frac{\lambda(\lambda-1)(\lambda-2)\cdots(\lambda-n 1)}{n!}\ ,\ \ {\lambda \choose 0}=1