tex(はてな記法、mimetex)
実際のコード↓
[tex:\white \tiny 0 \small 1 \normalsize 2 \large 3 \Large 4 \LARGE 5 \huge 6 \Huge7] [tex:\LARGE \white e^{i\pi} + 1=0] [tex:\LARGE \white e^x=\sum_{n=0}^\infty\frac{x^n}{n!}] [tex:\white \Large A = \large\left( \begin{array}{c.cccc}&1&2&\cdots&n\\ \hdash1&a_{11}&a_{12}&\cdots&a_{1n}\\ 2&a_{21}&a_{22}&\cdots&a_{2n}\\ \vdots&\vdots&\vdots&\ddots&\vdots\\ n&a_{n1}&a_{n2}&\cdots&a_{nn}\end{array}\right) ] [tex:\Large \blue \nabla \cdot E =\LARGE \frac{\rho }{\epsilon_0}] [tex:\Large \red \nabla \times E =-\LARGE\frac{\partial B}{\partial t}] [tex:\Large \yellow \nabla \cdot B =0] [tex:\Large \green \nabla \times H = j + \LARGE\frac{\partial D}{\partial t}]