# Using the displaymath shorthand  for equation or align instead

I want to be able to use the $...$ shorthand to enter either the equation or align environment instead of the displaymath environment. Is it possible to do this? I know you can define new commands, but I'm not sure if it is a problem if they are already defined.

Context: I use MultiMarkDown and you use \$ and \$ to enter math using raw LaTeX. It works fine, except that the math environment you are entering is displaymath instead of equation or align.

I'd really appreciate any help.

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I'm not sure what syntax you want. If you want to change $ and $, just use something like:

If you want to use commands \$ and \$ with double backslash, things may be more complex. It is possible, but difficult to implemented, and not recommended, since there is already a \\ command and usage \\[2ex].