Math & Science ⇒ Typesetting 'argmin' with Constraints

[ggyyree]

Hi smart guys,

I would like to type a line of math like this.

Code: Select all

\begin{align}
\arg &\min ABC \\
s.t. A &= 1 \\
B &= 2
\end{align}

1. I want to make the font size of these two lines

   Code: Select all

   s.t. A &= 1 \\
   B &= 2

   to be smaller than \arg &\min ABC
2. I want to make the = of the constrains to be aligned with the letter A of \arg &\min ABC

Please advise me how to do these. Thanks very much.

PS: I attached an example and please look at the image.

[localghost]

Try something like this.

Code: Select all

\documentclass[11pt]{article}
\usepackage[T1]{fontenc}
\usepackage{mathtools}    % loads »amsmath«

\DeclareMathOperator*{\argmin}{argmin}

\begin{document}
  \begin{equation}
    \argmin_{%
      \substack{%
        \text{s.\,t.}\, A=1 \\
        \phantom{\text{s.\,t.}}\, B=2
      }
    }
    ABC
  \end{equation}
\end{document}

Further reading:

• The »Math mode« document.

Thorsten

[ggyyree]

Work like a charm! Thanks so much!