What is the purpose of : in math mode?

by manooooh   Last Updated May 16, 2019 05:23 AM

What is the purpose of $:$?

We know that in math mode one should write in natural language and not being so strict with math notation.

For example: $f:A\to B$ is not "correct", the correct way would be $f\colon A\to B$ (and variants).

I do not remember any math book that uses the colon as part of a sentence in math mode.

The only 2 uses I can give to $:$ is when are learning about divisions ($2:4=1:2$) and for scales ($1:2$).

Does (La)TeX give a meaning of : in math mode?

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