答案1
operators
您可以重新定义数学字体(指向主文本字体)中正常大小的括号。
\documentclass{article}
\usepackage{amsmath}
\usepackage{newtxtext}
\usepackage[lite]{mtpro2}
\DeclareMathDelimiter{[}{\mathopen} {operators}{`[}{largesymbols}{"02}
\DeclareMathDelimiter{]}{\mathclose}{operators}{`]}{largesymbols}{"03}
\begin{document}
$[x_n\to x\text{ in }\sigma(E,E^*)]$
[$x_n\to x\text{ in }\sigma(E,E^*)$]
$[\bigl[\Bigl[$
\end{document}