%#!lualatex
\documentclass{article}
\usepackage[a4paper]{geometry}
-
-\usepackage{fontspec}
-
-\usepackage{luatexja}
-\makeatletter\ltj@alljachar %←全部の(>=U+0080な)文字を和文文字扱いに!
+\makeatletter
\usepackage{unicode-math}
-\setmathfont{XITSMath}
+
+\usepackage{luatexja-fontspec}
\setmainjfont{IPAGothic}
+\setmathfont{XITSMath}
-\begin{document}\makeatletter
+\ltj@alljachar %←全部の(>=U+0080な)文字を和文文字扱いに!
+\setmainfont{TexGyreTermes}
+\reDeclareMathAlphabet{\mathtestA}{\mathrm}{\mathmc}
+\reDeclareMathAlphabet{\mathtestB}{\mathrm}{\mathtestb}
+\reDeclareMathAlphabet{\mathtestC}{\mathtesta}{\mathmc}
+\reDeclareMathAlphabet{\mathtestD}{\mathtesta}{\mathtestb}
+\reDeclareMathAlphabet{\mathtestE}{\mathtestE}{\mathmc}
+\begin{document}\makeatletter
\[
\frac1{1^2}+\frac1{2^2}+\cdots=
\sum_{n=1}^\infty \frac1{n^s}=\zeta(2)=\frac{\pi^2}{6}
=\frac16\cdot \pi\times\pi,\qquad a_1,\dots,a_n.
\]
+$\hslash$
○×○漢×漢\times 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.
+
+\kanjifamily{mc}\selectfont
+$あいうえおabcde a^\mathrm{b}$
+
+mathrm: $\mathrm{\alpha あいうえおabcde}^\mathrm{b}$
+
+mathbf: $\mathbf{\alpha あいうえおabcde}$
+
+mathmc: $\mathmc{\alpha あいうえおabcde}$
+
+mathgt: $\mathgt{\alpha あいうえおabcde}$
+
+\tt\meaning\mathtestA
+
+\tt\meaning\mathtestB
+
+\tt\meaning\mathtestC
+
+\tt\meaning\mathtestD
+
+\tt\meaning\mathtestE
+
+\meaning\lfloor
+\[
+\lceil x\rceil + \lfloor x\rfloor +\hat a-\sqrt{a} - [\hbar]
+\]
\end{document}