How to typeset argmin and argmax in Markdown?

Question

There are posts in TeX.SE that shows how argmin and argmax with limits can be typesetted using the \DeclareMathOperator* command. But how to do this in Markdown?

I am especially interested in doing this in Jupyter Notebook when I'm documenting in Markdown.

Is this possible?

Answer 1

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

Syntax:

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

Example:

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

Answer 2

This worked for me when using pandoc for markdown-to-PDF conversion. (The subscript 'a' is correctly placed underneath the 'argmin'):

---
header-includes:
    - \newcommand{\argmin}{\mathop{\mathrm{argmin}}\limits}
---

Some text.

$A = \argmin_a f(a)$

Answer 3

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.

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

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