amsmathmath-modexfrac
I want to write this equation in LaTeX:
This my LaTeX code for the equation:
\begin{equation} \nonumber
q^*_1 =\frac{\text{number of women who had their second birth in 1971}}{\text{number of women who had their first birth in 1970 \textbf{-} number of women had their second birth in 1970}}
\end {equation}
How can write the denominator as given in the picture?
Use a minipage
\documentclass{article}
\usepackage{amsmath}
\begin{document}
We make the further assumption that
\begin{equation}\label{eqn:assumption}
\begin{minipage}{0.9\textwidth}
There is a bounded linear operator
$B:X\to X^*$ such that $B^*=B$ and the operator $JB$ is an
extension of $T'(0)$
\end{minipage}
\end{equation}
\end{document}
The picture can be reproduced as follows:
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{equation*}
df=
\frac{
\left(\dfrac{s_{1}^{2}}{n_1}+\dfrac{s_{2}^{2}}{n_2}\right)^{\!2}
}{
\dfrac{(s_{1}^{2}/n^{}_1)^2}{n_1-1}+
\dfrac{(s_{2}^{2}/n^{}_2)^2}{n_2-1}
}
\end{equation*}
\end{document}
Subtle points:
^{\!2} will push the exponent a bit towards the large parenthesis;^{} make the subscripts to the n in the upper floor of the denominator align with those of s.
Best Answer
A simple way is to use
arrayfor the denominator