I'm new to LaTeX and I was wondering how to write a command that gives me \left\{A,B\right\}. I want to renew this command like \poisson, for example.

If someone could help me, I will be very grateful.

Sorry if the question is basic.


  • \newcommand{\poisson}{\left\{A,B\right\}} in preamble, and then should be used in math mode. If you want to make A,B variables, you can. So would use \newcommand{\poisson}[2]{\left\{#1,#2\right\}} as \poisson{X}{Y}. – Sigur May 20 '17 at 1:51
  • Package physics already has \pb{A}{B}. – Johannes_B May 20 '17 at 5:18
  • Sometimes defining a simple command can do the job, sometimes using one of the thousands of packages adding extra functionality to basic LaTeX can do the job. Depends. – Johannes_B May 20 '17 at 5:19

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