%#!lualatex
\documentclass{article}
\usepackage[a4paper]{geometry}
+
+\usepackage{luatexja-fontspec}
+
\usepackage{luatexja}
\makeatletter\ltj@alljachar %←全部の(>=U+0080な)文字を和文文字扱いに!
-\usepackage{fontspec,unicode-math}
-\ExplSyntaxOn
-\cs_set:Npn \um_set_mathcode:nnnn #1#2#3#4 {
- \Umathcode \int_eval:n {#1} =
- \mathchar@type#2 \csname sym#3\endcsname \int_eval:n {#4} \scan_stop:
- \directlua{luatexja.math.is_math_letters[\int_eval:n {#4}]=true}
-}
-\cs_set:Npn \um_set_mathcode:nnn #1#2#3 {
- \Umathcode \int_eval:n {#1} =
- \mathchar@type#2 \csname sym#3\endcsname \int_eval:n {#1} \scan_stop:
- \directlua{luatexja.math.is_math_letters[\int_eval:n {#1}]=true}
-}
-\cs_set:Npn \um_set_mathchar:NNnn #1#2#3#4 {
- \Umathchardef #1 =
- \mathchar@type#2 \csname sym#3\endcsname \int_eval:n {#4} \scan_stop:
- \directlua{luatexja.math.is_math_letters[\int_eval:n {#4}]=true}
-}
-\ExplSyntaxOff
-
+\usepackage{unicode-math}
\setmathfont{XITSMath}
+\setmainjfont{IPAGothic}
\begin{document}\makeatletter
\[
\frac1{1^2}+\frac1{2^2}+\cdots=
\sum_{n=1}^\infty \frac1{n^s}=\zeta(2)=\frac{\pi^2}{6}
-=\frac16\cdot \pi\times\pi,\qquad a_1,\dots,a_n
+=\frac16\cdot \pi\times\pi,\qquad a_1,\dots,a_n.
\]
-aaa○×○漢×漢\times \dots←数式外では和文文字扱いのままになっている.
+
+$
+ \frac1{1^2}+\frac1{2^2}+\cdots=
+\sum_{n=1}^\infty \frac1{n^s\zeta}=\zeta(2)=\frac{\pi^2}{6}
+=\frac16\cdot \pi\times\pi,\qquad a_1,\dots,a_n. \hbar
+$
+
+{\tt\meaning\sum}
+
+
+○×○漢\ltjjachar`\×漢\ltjalchar`\×漢\times 漢
+え\ltjjachar`\“え\ltjalchar`\“え\textquotedblleft え“え
+←数式外では和文文字扱いのままになっている.
\end{document}