Text Formatting ⇒ Writing the "span" Operator

[zainah]

Dear all,

how to write the equation below correctly?

Code: Select all

A=span{g_1, ad_fg_1, \cdots, {ad_f}^{n_1 -1} g_1}

Thanks

[localghost]

Declare a new operator by the amsmath package. The package manual gives more details.

Code: Select all

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

\DeclareMathOperator{\Span}{span}

\begin{document}
  \[
    A=\Span\{g_1, ad_fg_1, \cdots, {ad_f}^{n_1 -1} g_1\}
  \]
\end{document}

Note the syntax of the new operator. The command \span is a TeX primitive, thus already defined.


Best regards and welcome to the board
Thorsten