I am forced to use plain TeX instead of LaTeX and I don't know what is the proper way to type argmin with some variable under it.

I know

$$ \min_b. $$ 

And I would like to do someething similar, but with argmin instead of min.


$$ \argmin $$

doesn't exist :(

Please, does anyone have the knowladge how to do this?

Thanks in advance!



Define it just like \min is defined:

\def\argmin{\mathop{\rm argmin}}
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