Math & Science ⇒ Space problem with square root

[Cham]

I'm having a spacement problem with the following square root.

I need the left square root to be exactly of the same size as the one on the right. Currently, if you look carefully, the left horizontal bar is slightly lower than the one on the right (because of the "d" symbol, I guess), and the lower-left "spike" is lower than the one on the right (probably because of the "0").

Code: Select all

\documentclass[12pt,letterpaper]{article}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{amsmath}
\usepackage{tensor}

\begin{document}
	\begin{equation}
		\label{vitesse des ondes sonores}
		\tensor{v}{_{s}} = \sqrt{\frac{\gamma \, \tensor{p}{_0}}{\tensor{\rho}{_0}}} \equiv \sqrt{\frac{d p}{d \rho}}.
	\end{equation}
\end{document}

Here's a preview :

square-roots.jpg (9.03 KiB) Viewed 7404 times

How can I make both square-roots of the same shape and size (same as the one on the right) ?
I tried to use the \smash command, but no luck yet.

[Cham]

Hmm, I think I got it. Adding \vphantom{d} in the first fraction seems to solve my problem.

[Stefan Kottwitz]

Good, often a workaround using \vphantom or \rule (with 0pt line thickness but certain height) helps.

Stefan

[localghost]

You could also try \mathstrut where needed.

Code: Select all

\documentclass[11pt]{article}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{amsmath}
\usepackage{tensor}

\begin{document}
  \begin{equation}
    \label{vitesse des ondes sonores}
    \tensor{v}{_{s}} = \sqrt{\frac{\gamma \, \tensor{p}{_0}\mathstrut}{\tensor{\rho}{_0}}} \equiv \sqrt{\frac{d p}{d \rho}}.
  \end{equation}
\end{document}

Thorsten