How to typeset argmin and argmax in Markdown?

The way to do this is by using the \underset command.

Syntax:

\underset{<constraints>}{\operatorname{<argmax or argmin>}}

Example:

$\underset{c\in C}{\operatorname{argmax}}$

Maybe this is what you look for

$ \hat{\theta}^{MLE}=\underset{a}{\operatorname{\argmax}} P(D|\theta) = \frac{a_1}{a_1+a_0} $

The trick is done by \underset, which put a character under an expression, as you see below.

underset arg max

Anyway, I see widely used the simple underscore expression, along with \argand \max, as you see below.

plain arg max

If you want to know something more about the many ways you can choose, take a look at here: Command for argmin or argmax?

Hope to be helpful

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