在 TeX-Live 2014 中，我newtxsf.sty使用 TeX-Live 管理工具进行安装。然后我尝试了以下示例：
\documentclass{article}
\usepackage[sfdefault,scaled=.85]{FiraSans}
\usepackage[T1]{fontenc}
\usepackage{textcomp}
\usepackage{amsmath,amsthm}
\usepackage[cmintegrals]{newtxsf}
\begin{document}
$abcdef\cdot xyz\leq \alpha\beta\gamma\cdot\varphi\varepsilon\omega$
$x^2(x+1)=x^3+x^2>1$ for every $x\in\mathbb{N}$
\[ \int\limits_a^b x^2 \mathrm{d}x \]
\end{document}
序言部分故意保留为。但是，使用或texdoc newtxsf编译文档会产生pdflatexlatex
LaTeX Font Warning: Font shape `U/ntxsym/m/n' undefined
(Font) using `U/ntxexa/m/n' instead on input line 11.
我不太明白为什么会发生这种情况，因此也不知道如何解决这个问题。
作为对 Ulrike 评论的后续评论：
This is pdfTeX, Version 3.14159265-2.6-1.40.15 (TeX Live 2014) (preloaded format=pdflatex 2015.2.14) 18 SEP 2016 19:57
entering extended mode
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Package: newtxsf 2015/04/07 v1.02
`newtxsf' v1.02, 2015/04/07 Math macros based on STIX sans serif and txfonts (m
sharpe) (/usr/local/texlive/2014/texmf-dist/tex/generic/kastrup/binhex.tex)
\tx@Isdigit=\count100
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line 55.
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ne 56.
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\symlettersA=\mathgroup4
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\symlargesymbolsTXA=\mathgroup7
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LaTeX Font Info: ... okay on input line 9.
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(/usr/local/texlive/2014/texmf-dist/tex/latex/newtx/omsntxsy.fd
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LaTeX Font Info: ... okay on input line 9.
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(/usr/local/texlive/2014/texmf-dist/tex/latex/newtx/untxexa.fd
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LaTeX Font Info: ... okay on input line 9.
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(/usr/local/texlive/2014/texmf-dist/tex/latex/fira/T1FiraSans-OsF.fd
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(Font) using `U/ntxexa/m/n' instead on input line 11.
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(/usr/local/texlive/2014/texmf-dist/tex/latex/newtx/untxsyc.fd
File: untxsyc.fd 2012/04/12 Fontinst v1.933 font definitions for U/ntxsyc.
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{/usr/local/texlive/2014/texmf-var/fonts/map/pdftex/updmap/pdftex.map}] (./clea
nfonttest.aux)
LaTeX Font Warning: Some font shapes were not available, defaults substituted.