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$$ H(Y | X)=\sum_{x \in \mathcal{X}, y \in \mathcal{Y}} p(x, y) \log \left(\frac{p(x)}{p(x, y)}\right) $$ \[\frac{-b\pm\sqrt{b^2-4ac}}{2a}\] $$ 6 \mathrm{CO}_{2}+6 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}+6 \mathrm{O}_{2} $$ $$ \left( \begin{array} c t ^ { \prime } \\ x ^ { \prime } \\ y ^ { \prime } \\ z ^ { \prime } \end{array} \right) = \left( \begin{array} { c c c c } { \gamma } & { - \gamma \beta } & { 0 } & { 0 } \\ { - \gamma \beta } & { \gamma } & { 0 } & { 0 } \\ { 0 } & { 0 } & { 1 } & { 0 } \\ { 0 } & { 0 } & { 0 } & { 1 } \end{array} \right) \left( \begin{array} c t \\ x \\ y \\ z \end{array} \right) $$ \begin{equation} x = a_0 + \cfrac{1} {a_1 + \cfrac{1}{a_2 + \cfrac{1}{a_3 + a_4}}} \end{equation} Quadratic formula \begin{equation} \quad x=\frac{-b \pm \sqrt{b^{2}-4 a c}}{2 a} \end{equation} \begin{equation} V\left(\frac{-b}{2 a}, \frac{-\Delta}{4 a}\right) \end{equation} $$ Branched molecule \vspace{.5cm} \chemfig{H-C(-[2]H)(-[6]H)-C(=[1]O)-[7]H} $$