1
$$\alpha, \beta, \Gamma, \Delta, \theta, \Omega$$

1
$$\epsilon, \varepsilon, \phi, \varphi$$

1
$$x_i, x^2, x^{y^z}, x_{i,j}, e^{-\alpha t}$$

1
$$\frac{a}{b}$$

1
$$\dfrac{1+\frac{a}{b}}{1+\frac{b}{a}}$4

1
$$\sqrt{x}, \sqrt[n]{x}$$

1
$$\sum_{i=1}^n a_i$$,
2
$$\int_a^b f(x) \, dx$$,
3
$$\iint_D dA$$,
4
$$\oint_C \mathbf{F} \cdot d\mathbf{r}$$

1
$$\lim_{x \to 0} \frac{\sin x}{x} = 1$$
2
$$f'(x), \frac{df}{dx}, \frac{\partial^2 u}{\partial x^2}$$

1
$$
2
\begin{pmatrix}
3
  a & b \\
4
  c & d \\
5
\end{pmatrix}, \quad
6
\begin{bmatrix}
7
  0 & \cdots & 1 \\
8
  \vdots & \ddots & \vdots \\
9
\end{bmatrix}, \quad
10
\begin{vmatrix}
11
  x & y \\
12
  z & w \\
13
\end{vmatrix}
14
$$

1
$$
2
f(n) =
3
\begin{cases}
4
  n/2 & \text{if } n \text{ even} \\
5
  3n+1 & \text{if } n \text{ odd}
6
\end{cases}
7
$$

1
$\sin \theta, \cos \pi, \tan \phi$,
2
$\log_2 x, \ln e, e^x$,
3
$\nabla \cdot \mathbf{F}, \Delta u$

1
$$\forall x \in \mathbb{R}, \exists y \notin A$$,
2
$$A \cup B, A \cap B, A \subseteq B$$

1
$$a \neq b, x \geq y, \approx, \equiv \mod n$$

1
$$A \rightarrow B, \leftrightarrow$$,
2
$$\Rightarrow, \Leftrightarrow, \neg P \lor Q$$

1
$$
2
\begin{aligned}
3
  E &= mc^2 \\
4
  F &= ma \\
5
  \nabla \times \mathbf{B} &= \mu_0 \mathbf{J} + \epsilon_0 \frac{\partial E}{\partial t}
6
\end{aligned}
7
$$

1
$$
2
\begin{split}
3
  \cos(a + b) = \cos a \cos b - \sin a \sin b \\
4
  \sin(a + b) = \sin a \cos b + \cos a \sin b
5
\end{split}
6
$$

1
$\mathbb{R}, \mathcal{ABC}, \mathfrak{g}, \mathbf{v}$
2
$\left( \frac{a}{b} \right), \bigg[ \bigg]$

1
$$
2
f(x) = \sum_{n=0}^{\infty} \frac{f^{(n)}(a)}{n!} (x-a)^n
3
$$

1
$$
2
\mathbf{AB} =
3
\begin{pmatrix}
4
  \mathbf{A}_{11} & \cdots & \mathbf{A}_{1n} \\
5
  \vdots & \ddots & \vdots \\
6
  \mathbf{A}_{m1} & \cdots & \mathbf{A}_{mn}
7
\end{pmatrix}
8
\begin{pmatrix}
9
  \mathbf{B}_{11} & \cdots & \mathbf{B}_{1p} \\
10
  \vdots & \ddots & \vdots \\
11
  \mathbf{B}_{n1} & \cdots & \mathbf{B}_{np}
12
\end{pmatrix}
13
$$

1
$$
2
\mathcal{F}\{f(x)\} = \int_{-\infty}^{\infty} f(x) e^{-i2\pi\xi x} dx
3
$$