如何使下列方程组看起来更大?
即使我使用 'displaystyle' ,指数中的指数看起来仍然非常小。
\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[]{amsmath}
\usepackage[]{xcolor}
\usepackage[]{enumitem}
\usepackage[]{graphicx}
\allowdisplaybreaks
\title{something}
\author{someone}
\date{October 2016}
\begin{document}
\maketitle
\section{something}
\begin{enumerate}[label=(\alph*)]
\item
\begin{align*}
\displaystyle{\langle x_{b}, t_{b}|x_{a}, t_{a}\rangle}
&\displaystyle{= \int \mathcal{D}x\ \mathcal{D}p\ e^{iS/\hbar}}\\
&\displaystyle{= \lim_{N\to\infty}\prod_{i=1}^{N}\bigg[\int_{-\infty}^{\infty}dx_{i}\bigg]\prod_{j=1}^{N+1}\bigg[\int_{-\infty}^{\infty}\frac{dp_{j}}{2\pi\hbar}\bigg]e^{iS_{N}/\hbar}}\\
&\displaystyle{= \lim_{N\to\infty}\prod_{i=1}^{N}\bigg[\int_{-\infty}^{\infty}dx_{i}\bigg]\prod_{j=1}^{N+1}\bigg[\int_{-\infty}^{\infty}\frac{dp_{j}}{2\pi\hbar}\bigg]
e^{\frac{i}{\hbar}\sum\limits_{k=1}^{N+1}[p_{k}(x_{k}-x_{k-1})-\epsilon H(p_{k},x_{k},t_{k})]}}.
\end{align*}
\end{enumerate}
\end{document}
答案1
上标中的数学运算符的上标和下标非常小。因此,将最后一行上标中的数学表达式移到主行是明智的,即替换e^{...}
为\exp(...)
实际上就是为了解决这种情况:
\documentclass{article}
\usepackage{mathtools}
\begin{document}
\begin{align*}
\langle x_{b}, t_{b}|x_{a}, t_{a}\rangle
& = \int \mathcal{D}x\,\mathcal{D}p\,\mathrm{e}^{iS/\hbar}\\
& = \lim_{N\to\infty}\prod_{i=1}^{N}\biggl[\int_{-\infty}^{\infty}dx_{i}\biggr]
\prod_{j=1}^{N+1}\biggl[\int_{-\infty}^{\infty}\frac{dp_{j}}{2\pi\hbar}\biggr]
\mathrm{e}^{iS_{N}/\hbar}\\
& = \begin{multlined}[t][0.7\textwidth]
\lim_{N\to\infty}\prod_{i=1}^{N}\biggl[\int_{-\infty}^{\infty}dx_{i}\biggr]
\prod_{j=1}^{N+1}\biggl[\int_{-\infty}^{\infty}\frac{dp_{j}}{2\pi\hbar}\biggr] \\
\exp\biggl(\frac{i}{\hbar}\sum_{k=1}^{N+1}[p_{k}(x_{k}-x_{k-1})-\epsilon H(p_{k},x_{k},t_{k})]\biggr).
\end{multlined}
\end{align*}
\end{document}