Text Formatting ⇒ How do I get these two operators to be in the same hight?

[Yue]

Hello ppl It is my first time posting here.
I have trouble getting these two operators in the same height:
$\c_{\textbf{k}}^\dagger$ and $\c_{\textbf{k}'}^\dagger$. The k's should be at the same level, but the ' is somehow making the k' lower.
Anyone who can help?

[gmedina]

Please post complete compilable code.

[Yue]

Please post complete compilable code.

here it is:

\listfiles
\documentclass[a4paper, twoside, 12pt]{memoir}
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amsthm}
\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[danish]{babel}
\usepackage{bbm}
\usepackage[mathscr]{euscript}
\usepackage{ifthen}


\begin{document}
\section{Hi}
$c_{\textbf{k}}^\dagger c_{\textbf{k}'}^\dagger=0$

\end{document}

[gmedina]

You can use a \phantom command to create an "invisible" prime for the first k:

Code: Select all

\documentclass[a4paper, twoside, 12pt]{memoir}
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amsthm}
\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[danish]{babel}
\usepackage{bbm}
\usepackage[mathscr]{euscript}
\usepackage{ifthen}


\begin{document}
\section{Hi}
$c_{\textbf{k}\phantom{\sp{\prime}}}^\dagger c_{\textbf{k}'}^\dagger=0$

\end{document}

[Yue]

Man thank you so much! And so fast replies. Are you employed here or are you just very friendly and helpful?:)

Btw, what does \sp do?

[svend_tveskaeg]

See (for example) the last item before subsection 6.5 in LaTeX2man manual, concerning the \sp command.

Google is your friend!

[gmedina]

See (for example) the last item before subsection 6.5 in LaTeX2man manual, concerning the \sp command.

Google is your friend!

Well, that document explains some \SP command which evidently is not the same as the \sp command that I used (LaTeX is case-sensitive), so yes... Google is your friend if you use it well.

Answering Yue's question, \sp is the command that produces superscripts; in fact the sign "^" is nothing but an alias for \sp. Analogously, "_" is just an alias for \sb:

Code: Select all

\documentclass{article}

\begin{document}

$a^{2}_{i}$ $a\sp{2}\sb{i}$

\end{document}

[Yue]

Thx alot