Some commonly forgotten latex command backups

Latex is very handy after the proficiency, and in fact, often the command is not too much. But every time I use latex to write a paper, there will always be one or two commands to remember, the result has to be in Google every time boil. So today, the usual command back up here, I hope you do not have to re-search every time ...

Another few years have not been issued, the opportunity table exists.

	{a \brack B}
	{A \choose a_1,a_2} Or \binom {a} {a_1,a_2}
	{a \brace B}
	{a \bangle B} with \def \bangle{\atopwithdelims \langle \rangle}.
Figure	\BEGIN{FIGURE}[!HT] \centering \includegraphics[scale=0.5]{img/pf.png} \caption{sub-soutions represented as points in coordinate system} \begin{flushleft} \end{flushleft} \LABEL{FIG:PF} \end{figure}
Multiline underneath subscript Multi-line lower limit	\usepackage Amsmath \underset{\substack{k\in s;\\ M\in [1,n] } }{minmax}
Predefined symbols The theory of Complexity	\USEPACKAGE{AMSSYMB} \newcommand{\nph}{\mathcal{np-}hard} \newcommand{\ostar}[1]{\mathcal{o}^* (#1)} \newcommand{\bigo}[1]{\mathcal{o} (#1)}
Bibtex	\BIBLIOGRAPHYSTYLE{SPMPSCI} \BIBLIOGRAPHY{REF}% The file name is Ref.bib Use \cite{} to cite

Updated continuously.

Note: The top four from http://www.combinatorics.net/weblib/commands/command.html

Some commonly forgotten latex command backups