This is ptex2pdf[.lua] version 0.4.
Processing tw,test1.tex.
This is e-pTeX, Version 3.1415926-p3.4-110825-2.6 (utf8.sjis) (TeX Live 2013/W32TeX)
\documentclass[a4paper,12pt]{book}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{latexsym}

\pagestyle{plain}

\newtheorem{ほだい}{補題}
\newtheorem{ていり}{定理}
\setcounter{section}{0}

\begin{document}
$$\inf_{u_{1},u_{2}はともに0ではない整数}|f(u_1,u_2)|$$
\end{document}

これをplate(ptex2pdf)でタイプセットすると，次のエラーメッセージです．



 restricted \write18 enabled.
entering extended mode
(./tw,test1.tex
pLaTeX2e <2006/11/10> (based on LaTeX2e <2011/06/27> patch level 0)
Babel <3.9f> and hyphenation patterns for 78 languages loaded.
(c:/texlive/2013/texmf-dist/tex/latex/base/book.cls
Document Class: book 2007/10/19 v1.4h Standard LaTeX document class
(c:/texlive/2013/texmf-dist/tex/latex/base/bk12.clo))
(c:/texlive/2013/texmf-dist/tex/latex/amsmath/amsmath.sty
For additional information on amsmath, use the `?' option.
(c:/texlive/2013/texmf-dist/tex/latex/amsmath/amstext.sty
(c:/texlive/2013/texmf-dist/tex/latex/amsmath/amsgen.sty))
(c:/texlive/2013/texmf-dist/tex/latex/amsmath/amsbsy.sty)
(c:/texlive/2013/texmf-dist/tex/latex/amsmath/amsopn.sty))
(c:/texlive/2013/texmf-dist/tex/latex/amsfonts/amssymb.sty
(c:/texlive/2013/texmf-dist/tex/latex/amsfonts/amsfonts.sty))
(c:/texlive/2013/texmf-dist/tex/latex/base/latexsym.sty)
No file tw,test1.aux.
(c:/texlive/2013/texmf-dist/tex/latex/amsfonts/umsa.fd)
(c:/texlive/2013/texmf-dist/tex/latex/amsfonts/umsb.fd)
(c:/texlive/2013/texmf-dist/tex/latex/base/ulasy.fd)
! Not two-byte family.
l.14 $$\inf_{u_{1},u_{2}は
                          ともに0ではない整数}|f(u_1,u_2)|$$
? 
処理はユーザによって中断されました