Line feed: \ \
Equal sign alignment:
\begin{align}
a & amp= 1+2\
& amp=3
\end{align}
Fraction: \frac{ numerator} {denominator}
Sum: \sum_{ subscript} {superscript}
Product: \prod_{ subscript} {superscript}
Underline: \ Underline {formula}
Underline: \underline{ formula}
Roman style: \mathrm{ character}
Top curve: \ tilde {}
Approximately equal to: \ approximately
Less than or equal to: \leq
Small broken line at the top of the letter: \hat{y}
Similar symbol: \sim
Number the formula: \tag{}
Argmax: \ arg \ underset {y} or \ arg \ max _ y.
Piecewise function:
\begin{cases}
Formulas and conditions
\end{cases}
Gradient: \nabla
Partial derivative: \partial
Ellipsis: \cdot, single \cdot
,
Handwriting: \mathcal{ capital letters}
Bold: \textbf{ capital letters}
\mathbb{E}
Empty set: \varnothing
Right arrow, others are similar: \rightarrow.
Belongs to: \in
Contains: \ subseteq
Element multiplication (empty circle): \circ
Multiplication symbol: \ times
Vector:
o^t=
\ Left [
\begin{matrix}
a_t\
o_t^u\
o_t^{db}
\end{matrix}
\ right]
Matrix, a row of elements with &; different
,
Bold italics: \boldsymbol
Is proportional to: \propto
Infinite: \infty
Any: \forall
Existence: \ Existence