$N=\left\lfloor 0.5-\log_{2}\left(\frac{\text{Frequency of this item}}{\text{ Frequency of most common item}}\right)\right\rfloor$


$\mathbf{\nabla}\times\mathbf{B}=\mu_{0}\mathbf{J}+\underbrace{\mu_{0}\epsilon_{0}\frac{\partial}{\partial t}\mathbf{E}}_{\mathrm{Maxwell^{\prime}s\ term}}$


$1+\cfrac{1}{2+\cfrac{1}{5+\cfrac{1}{5+\cfrac{1}{4+\ddots}}}}$


$\,{}^{238}_{92}\mathrm{U}+\,^{64}_{28}\mathrm{Ni}\to\,^{302}_{120}\mathrm{Ubn}^{*}\to\ \mathit{fission\ only}$


$0\to G^{\wedge}\stackrel{\pi^{\wedge}}{\to}X^{\wedge}\stackrel{\imath^{\wedge}}{\to}H^{\wedge}\to 0$


$w=\begin{cases}w^{*}&\mbox{if }w^{*}>\frac{1}{2},\\ \frac{1}{2}&\mbox{if }w^{*}\leq\frac{1}{2}.\\ \end{cases}$


$\begin{bmatrix}V_{1}\\ I_{2}\end{bmatrix}=\begin{bmatrix}h_{11}&h_{12}\\ h_{21}&h_{22}\end{bmatrix}\begin{bmatrix}I_{1}\\ V_{2}\end{bmatrix}$


$L(\lambda,\alpha,s)=\sum_{n=0}^{\infty}\frac{\exp(2\pi i\lambda n)}{(n+\alpha)^{s}}.$


$\ ax^{2}+bx+c=0$


$O(mn\log m)$


$A\oplus B=(A^{c}\ominus B^{s})^{c}$


$\cos\alpha=-\cos\beta\cos\gamma+\sin\beta\sin\gamma\cosh\frac{a}{k},\,$


$\forall x,y\in A\;[x\neq y\rightarrow\neg\exists z\in X\;[z\leq x\land z\leq y]].$


$\tau_{\text{rms}}=\sqrt{\frac{\int_{0}^{\infty}(\tau-\overline{\tau})^{2}A_{c}(\tau)d\tau}{\int_{0}^{\infty}A_{c}(\tau)d\tau}}$


$x-1-\frac{1}{2}-\frac{1}{4}-\frac{1}{5}-\frac{1}{6}-\frac{1}{9}-\cdots=1$


$P_{i}^{x}=\frac{N!}{n_{x}!(N-n_{x})!}p_{x}^{n_{x}}(1-p_{x})^{N-n_{x}}$


$H_{ij}=\begin{bmatrix}{\partial^{2}V_{ij}\over\partial x_{i}\partial x_{j}}&{\partial^{2}V_{ij}\over\partial x_{i}\partial y_{j}}&{\partial^{2}V_{ij}\over\partial x_{i}\partial z_{j}}\\ {\partial^{2}V_{ij}\over\partial y_{i}\partial x_{j}}&{\partial^{2}V_{ij}\over\partial y_{i}\partial y_{j}}&{\partial^{2}V_{ij}\over\partial y_{i}\partial z_{j}}\\ {\partial^{2}V_{ij}\over\partial z_{i}\partial x_{j}}&{\partial^{2}V_{ij}\over\partial z_{i}\partial y_{j}}&{\partial^{2}V_{ij}\over\partial z_{i}\partial z_{j}}\end{bmatrix}$


$\qvar{*1*}\left(\frac{\text{Frequency \qvar{*2*}}}{\text{Frequency \qvar{*3*}}}\right)$


$1+\cfrac{1}{\qvar{*1*}+\cfrac{1}{\qvar{*2*}}}$


$\,{}^{238}_{92}\mathrm{U}+\qvar{*1*}\to\qvar{*2*}$


$\qvar{*1*}^{\wedge}\stackrel{\qvar{*2*}^{\wedge}}{\to}\qvar{*3*}^{\wedge}$


$\qvar{*1*}=\{\begin{array}[]{ll}\qvar{*2*}&\mbox{if }\qvar{*3*}>\frac{1}{2}\\ \qvar{*4*}&\mbox{if }\qvar{*3*}\leq\frac{1}{2}\\ \end{array}$


$\qvar{*1*}=\begin{bmatrix}\qvar{*2*}&\qvar{*3*}\\ \qvar{*4*}&\qvar{*5*}\end{bmatrix}\begin{bmatrix}\qvar{*6*}\\ \qvar{*7*}\end{bmatrix}$


$L(\qvar{*1*},\qvar{*2*},\qvar{*3*})=\sum_{\qvar{*4*}=0}^{\infty}\frac{\exp(2\pi i\qvar{*1*}\qvar{*4*})}{(\qvar{*4*}+\qvar{*2*})^{\qvar{*3*}}}$


$\qvar{*1*}x^{2}+\qvar{*2*}x+\qvar{*3*}=0$


$A~{}\qvar{*1*}~{}B=(\qvar{*2*})^{\qvar{*3*}}$


$\qvar{*1*}\alpha=-\qvar{*1*}\beta\qvar{*1*}\gamma+\qvar{*2*}\beta\qvar{*2*}\gamma\qvar{*3*}$


$\forall x,y\in\qvar{*1*}\;[x\neq y\rightarrow\qvar{*2*}]$


$\qvar{*1*}=\sqrt{\frac{\int_{0}^{\infty}\qvar{*2*}^{2}\qvar{*3*}~{}d\qvar{*1*}}{\int_{0}^{\infty}\qvar{*3*}~{}d\qvar{*1*}}}$


$\frac{1}{\qvar{*1*}}-\frac{1}{\qvar{*2*}}-\frac{1}{\qvar{*3*}}-\frac{1}{\qvar{*4*}}-\frac{1}{\qvar{*5*}}$


$\frac{N!}{\qvar{*1*}!(N-\qvar{*1*})!}p^{\qvar{*1*}}(1-p)^{N-\qvar{*1*}}$


$H_{\qvar{*1*}}=\begin{bmatrix}{\partial^{2}\qvar{*2*}\over\qvar{*3*}}\end{bmatrix}$