ご返信大変ありがとうございます。添付写真のように仕上がり完璧でございます。ただ,uline--の導入がうまくいかないようで,uline--をダウンロードし,然るべきフォルダに格納し,mktexlsrにて更新しましたが,大熊様から頂いたex1ファイルがうまくコンパイルできません。以下のようなエラーメッセージが出ます。よろしければご教示ください。
This is ptex2pdf[.lua] version 20200520.0.
Processing ex1.tex
This is e-upTeX, Version 3.141592653-p4.1.1-u1.30-230214-2.6 (utf8.sjis) (TeX Live 2024) (preloaded format=platex)
restricted \write18 enabled.
entering extended mode
(./ex1.tex
pLaTeX2e <2023-02-14>+1, based on
LaTeX2e <2023-11-01> patch level 1
L3 programming layer <2024-02-20>
(c:/texlive/2024/texmf-dist/tex/platex/base/jarticle.cls
Document Class: jarticle 2020/09/30 v1.8f Standard pLaTeX class
(c:/texlive/2024/texmf-dist/tex/platex/base/jsize10.clo))
(c:/texlive/2024/texmf-dist/tex/platex/emathc210509/emath.sty
(c:/texlive/2024/texmf-dist/tex/latex/amsmath/amsmath.sty
For additional information on amsmath, use the `?' option.
(c:/texlive/2024/texmf-dist/tex/latex/amsmath/amstext.sty
(c:/texlive/2024/texmf-dist/tex/latex/amsmath/amsgen.sty))
(c:/texlive/2024/texmf-dist/tex/latex/amsmath/amsbsy.sty)
(c:/texlive/2024/texmf-dist/tex/latex/amsmath/amsopn.sty))
(c:/texlive/2024/texmf-dist/tex/latex/amsfonts/amssymb.sty
(c:/texlive/2024/texmf-dist/tex/latex/amsfonts/amsfonts.sty))
(c:/texlive/2024/texmf-dist/tex/platex/emathc210509/emathC.sty
(c:/texlive/2024/texmf-dist/tex/latex/tools/calc.sty)
(c:/texlive/2024/texmf-dist/tex/latex/graphics/keyval.sty)
(c:/texlive/2024/texmf-dist/tex/latex/base/ifthen.sty)
(c:/texlive/2024/texmf-dist/tex/platex/emathc210509/EMhairetu.sty))
(c:/texlive/2024/texmf-dist/tex/platex/emathc210509/emathE.sty
(c:/texlive/2024/texmf-dist/tex/platex/emathc210509/emathEc.sty
(c:/texlive/2024/texmf-dist/tex/platex/emathc210509/emathK.sty)
(c:/texlive/2024/texmf-dist/tex/latex/tools/enumerate.sty)
(c:/texlive/2024/texmf-dist/tex/platex/emathc210509/emathLb.sty))
(c:/texlive/2024/texmf-dist/tex/platex/emathc210509/jquote.sty))
(c:/texlive/2024/texmf-dist/tex/latex/amsfonts/umsa.fd)
(c:/texlive/2024/texmf-dist/tex/latex/amsfonts/umsb.fd))
(c:/texlive/2024/texmf-dist/tex/platex/emathc210509/emkasen.sty
(c:/texlive/2024/texmf-dist/tex/platex/emathc210509/uline--.sty
! LaTeX Error: Missing \begin{document}.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.1 <
!DOCTYPE html>
?