When I use the \frac command, I notice that the characters used for the fraction terms become smaller than those which are not in the \frac command. Is there a way to correct it?
4 Answers
A larger (nicer?) version of the fraction can be obtained with \dfrac.
\documentclass{article}
\usepackage{mathtools}
\begin{document}
\begin{align}
\gamma &= \frac{1}{\sqrt{1-\frac{v^2}{c^2}}} \\
& \notag \\
\gamma &= \dfrac{1}{\sqrt{1-\dfrac{v^2}{c^2}}}
\end{align}
\end{document}
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@barbarabeeton: The OP did not mention text mode ...– user31729Mar 29, 2015 at 7:10
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true, but the op didn't specify display mode either. it makes a difference. actually, while i agree totally with using
\dfracfor the "outer" one in your example, i think using it within the root is too much. the "intermediate" size (mentioned in another comment) is a good option here. Mar 29, 2015 at 13:35 -
@barbarabeeton: that's true too, but I had no impression that inline fractions are used. I used an
alignenvironment for true math, not inline, otherwisenicefracorxfracare the right choice– user31729Mar 29, 2015 at 18:17
For fractions, nicefrac may be preferred. Here's a comparison:
\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage{textcomp}
\usepackage{nicefrac}
\begin{document}
This is some text with a $\frac{1}{2}$ in it.
This is some text with a \textonehalf{} in it.
This is some text with a \nicefrac{1}{2} in it.
\end{document}
Another solution would be to use medium-sized fractions (~ 80% of displaystyle, defined in nccmath), plus a slight increase of \baselineskip with setstretch. For large operators, there is a \medop command:
\documentclass{article}
\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage{textcomp}
\usepackage{nccmath}
\usepackage{setspace}
\setstretch{1.1}
\begin{document}
This is some text without fractions.
This is some text without fractions. This is some text without fractions.
This is some text with a $\mfrac{1}{2}$ in it: $ p(x,y) = \medop\sum_{m=1}^{\infty} \medop\sum_{n=1}^{\infty} p_{mn} \sin \bigl(\mfrac{m \pi x}{a}\bigr) \sin \bigl(\mfrac{n \pi y}{b}\bigr) $
This is again some text without fractions. Again some text without fractions.
\end{document}
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There is one problem , if i use dfrac in this formula , some characters are small , some are big : $ p(x,y) = \sum_{m=1}^{\infty} \sum_{n=1}^{\infty} p_{mn} sin (\dfrac{m \pi x}{a}) sin (\dfrac{n \pi y}{b}) $– Farzad64Mar 29, 2015 at 11:34
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You shouldn't use
\dfracfor in-line formulae, unless you accept the interline skips be unequal! Note it is possible to obtain medium-sized operators like\sum,\prod, &c. See my updated answer. Btw, if you want to type the sine function, and not the product of 3 variabless, i, n, you should type\sinwith a backslash.– BernardMar 29, 2015 at 12:02 -
You can use \dfrac for larger fractions with bigger numbers. \dfrac belongs to the amsmath package, so you will need to import that. Also, the reason why it is called dfrac is because it is a \frac that is in display mode, which in general makes things larger.
\documentclass{article}
\usepackage{amsmath}
\begin{document}
Large Fraction: $\dfrac{1}{2}$
Small Fraction: $\frac{1}{2}$
\end{document}
BTW, if you want to do a fraction like "1/2" (with the slash) use \sfrac
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$1/2$instead of$\frac{1}{2}$.