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stix2 使用 boldsymbol （或 bm）抛出“LaTeX 字体警告”

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stix2 使用 boldsymbol （或 bm）抛出“LaTeX 字体警告”

我有以下两个 MWE：

\documentclass[preview]{standalone}

\usepackage{stix2}
\usepackage{amsmath}

\begin{document}
$\mathbfscr{A}$
\end{document}

和

\documentclass[preview]{standalone}

\usepackage{stix2}
\usepackage{amsmath}

\begin{document}
$\boldsymbol{\mathscr{A}}$
\end{document}

虽然两者都如预期的那样产生了粗体字样A，但这封信也发出了一系列警告，即

LaTeX Font Warning: Font shape `LS2/stix2ex/b/n' in size <10> not available
(Font) Font shape `LS2/stix2ex/m/n' tried instead on input line 7.
LaTeX Font Warning: Font shape `LS2/stix2ex/b/n' in size <7.5> not available
(Font) Font shape `LS2/stix2ex/m/n' tried instead on input line 7.
LaTeX Font Warning: Font shape `LS2/stix2ex/b/n' in size <6> not available
(Font) Font shape `LS2/stix2ex/m/n' tried instead on input line 7.
LaTeX Font Warning: Font shape `LS1/stix2bb/b/n' in size <10> not available
(Font) Font shape `LS1/stix2bb/m/n' tried instead on input line 7.
LaTeX Font Warning: Font shape `LS1/stix2bb/b/n' in size <7.5> not available
(Font) Font shape `LS1/stix2bb/m/n' tried instead on input line 7.
LaTeX Font Warning: Font shape `LS1/stix2bb/b/n' in size <6> not available
(Font) Font shape `LS1/stix2bb/m/n' tried instead on input line 7.
LaTeX Font Warning: Font shape `LS1/stix2bb/b/it' in size <10> not available
(Font) Font shape `LS1/stix2bb/m/it' tried instead on input line 7.
LaTeX Font Warning: Font shape `LS1/stix2bb/b/it' in size <7.5> not available
(Font) Font shape `LS1/stix2bb/m/it' tried instead on input line 7.
LaTeX Font Warning: Font shape `LS1/stix2bb/b/it' in size <6> not available
(Font) Font shape `LS1/stix2bb/m/it' tried instead on input line 7.
LaTeX Font Warning: Font shape `LS2/stix2cal/b/n' in size <10> not available
(Font) Font shape `LS2/stix2cal/m/n' tried instead on input line 7.
LaTeX Font Warning: Font shape `LS2/stix2cal/b/n' in size <7.5> not available
(Font) Font shape `LS2/stix2cal/m/n' tried instead on input line 7.
LaTeX Font Warning: Font shape `LS2/stix2cal/b/n' in size <6> not available
(Font) Font shape `LS2/stix2cal/m/n' tried instead on input line 7.
LaTeX Font Warning: Font shape `LS2/stix2tt/b/n' in size <10> not available
(Font) Font shape `LS2/stix2tt/m/n' tried instead on input line 7.
LaTeX Font Warning: Font shape `LS2/stix2tt/b/n' in size <7.5> not available
(Font) Font shape `LS2/stix2tt/m/n' tried instead on input line 7.
LaTeX Font Warning: Font shape `LS2/stix2tt/b/n' in size <6> not available
(Font) Font shape `LS2/stix2tt/m/n' tried instead on input line 7.

为什么其中一个会发出所有这些警告，而另一个却不会？stix2.sty字母定义如下：

\DeclareSymbolFont{symbols}      {LS1}{stix2scr}{m}{n}
\SetSymbolFont    {symbols}{bold}{LS1}{stix2scr}{b}{n}
\DeclareSymbolFontAlphabet{\mathscr}{symbols}

\DeclareMathAlphabet{\mathbfscr} {LS1}{stix2scr}{b}{n}

据我所知，\mathbfscr链接到{LS1}{stix2scr}{b}{n}和\boldsymbol使用链接到bold的模式。所以在我看来，这两者应该完全相同，但显然它们不是。有什么区别？为什么它们不一样？\mathscr{LS1}{stix2scr}{b}{n}

附加问题：我只使用了粗体形式\mathscr，为什么会出现针对各种字母和不同字体大小的所有其他警告，我从未尝试使用它们？

答案1

这基本上在回答您以前的问题时已经解释过了，但我将尝试在这里用不同的方式来解释。

首先要注意的\boldsymbol{x}是\text{\boldmath$x$}本地切换全部所有的数学字体\textstyle，\scriptstyle以及\scriptscriptstyle大小都设置为粗体，因此如前所述，stix2定义了很多字体，几乎所有字体都不是粗体，所以你会收到警告。

归根结底的原因是 Stix Two OpenType 数学字体没有粗体，如果您尝试使用测试文件，则会unicode-math得到：

\documentclass[preview]{standalone}

\ifx\directlua\undefinded
\usepackage{stix2}
\else
\usepackage{unicode-math}
\setmathfont{Stix Two Math}
\fi
\usepackage{amsmath}

\begin{document}
\boldmath
$\mathscr{A}$
\end{document}

LaTeX Font Warning: Font shape `TU/StixTwoMath(1)/b/n' undefined
(Font)              using `TU/StixTwoMath(1)/m/n' instead on input line 13.


LaTeX Font Warning: Font shape `TU/StixTwoMath(2)/b/n' undefined
(Font)              using `TU/StixTwoMath(2)/m/n' instead on input line 13.


LaTeX Font Warning: Font shape `TU/StixTwoMath(3)/b/n' undefined
(Font)              using `TU/StixTwoMath(3)/m/n' instead on input line 13.

StixTwoMathOpenType 字体有数千个字符。对于 pdftex，该stix2软件包将其拆分为多个字体，每个字体有 256 个字符，因此您会收到有关更多字体的警告，但本质上是完全相同的问题。


LaTeX Font Warning: Font shape `LS2/stix2ex/b/n' in size <10> not available
(Font)              Font shape `LS2/stix2ex/m/n' tried instead on input line 13
.


LaTeX Font Warning: Font shape `LS2/stix2ex/b/n' in size <7.5> not available
(Font)              Font shape `LS2/stix2ex/m/n' tried instead on input line 13
.


LaTeX Font Warning: Font shape `LS2/stix2ex/b/n' in size <6> not available
(Font)              Font shape `LS2/stix2ex/m/n' tried instead on input line 13
.

(/usr/local/texlive/2022/texmf-dist/tex/latex/stix2-type1/ls1stix2frak.fd)
(/usr/local/texlive/2022/texmf-dist/tex/latex/stix2-type1/ls1stix2bb.fd)

LaTeX Font Warning: Font shape `LS1/stix2bb/b/n' in size <10> not available
(Font)              Font shape `LS1/stix2bb/m/n' tried instead on input line 13
.


LaTeX Font Warning: Font shape `LS1/stix2bb/b/n' in size <7.5> not available
(Font)              Font shape `LS1/stix2bb/m/n' tried instead on input line 13
.


LaTeX Font Warning: Font shape `LS1/stix2bb/b/n' in size <6> not available
(Font)              Font shape `LS1/stix2bb/m/n' tried instead on input line 13
.


LaTeX Font Warning: Font shape `LS1/stix2bb/b/it' in size <10> not available
(Font)              Font shape `LS1/stix2bb/m/it' tried instead on input line 1
3.


LaTeX Font Warning: Font shape `LS1/stix2bb/b/it' in size <7.5> not available
(Font)              Font shape `LS1/stix2bb/m/it' tried instead on input line 1
3.


LaTeX Font Warning: Font shape `LS1/stix2bb/b/it' in size <6> not available
(Font)              Font shape `LS1/stix2bb/m/it' tried instead on input line 1
3.

(/usr/local/texlive/2022/texmf-dist/tex/latex/stix2-type1/ls2stix2cal.fd)

LaTeX Font Warning: Font shape `LS2/stix2cal/b/n' in size <10> not available
(Font)              Font shape `LS2/stix2cal/m/n' tried instead on input line 1
3.


LaTeX Font Warning: Font shape `LS2/stix2cal/b/n' in size <7.5> not available
(Font)              Font shape `LS2/stix2cal/m/n' tried instead on input line 1
3.


LaTeX Font Warning: Font shape `LS2/stix2cal/b/n' in size <6> not available
(Font)              Font shape `LS2/stix2cal/m/n' tried instead on input line 1
3.

(/usr/local/texlive/2022/texmf-dist/tex/latex/stix2-type1/ls1stix2sf.fd)
(/usr/local/texlive/2022/texmf-dist/tex/latex/stix2-type1/ls2stix2tt.fd)

LaTeX Font Warning: Font shape `LS2/stix2tt/b/n' in size <10> not available
(Font)              Font shape `LS2/stix2tt/m/n' tried instead on input line 13
.


LaTeX Font Warning: Font shape `LS2/stix2tt/b/n' in size <7.5> not available
(Font)              Font shape `LS2/stix2tt/m/n' tried instead on input line 13
.


LaTeX Font Warning: Font shape `LS2/stix2tt/b/n' in size <6> not available
(Font)              Font shape `LS2/stix2tt/m/n' tried instead on input line 13

请注意，对于 luatex 和 pdftex 来说，警告都位于\boldmath（隐藏在\boldsymbol原文中）设置所有粗体数学字体的位置，因此即使您不使用这些字符，也会收到警告。

通常通过在普通数学版本中添加粗体字体作为附加字体\bm来避免切换整个数学版本的成本\boldsymbol，但如前所述，stix2使用了很多字体，所以没有空闲空间，因此\bm会退回到\boldsymbol没有粗体字体的 stix，所以你会收到警告。

lualatex 和 xelatex 可以“动态”修改字体并生成粗体字体，因此如果（如@Davislor 在评论中所建议的）您还设置了粗体字体：

\documentclass[preview]{standalone}

\ifx\directlua\undefinded
\usepackage{stix2}
\else
\usepackage{unicode-math}
\setmathfont{Stix Two Math}
\setmathfont{STIX Two Math}[version=bold, FakeBold=1.2]
\fi
\usepackage{amsmath}

\begin{document}
\boldmath
$\mathscr{A}$
\end{document}

然后该文档由 lualatex 处理，没有任何字体警告。

答案2

第一次使用 中的符号时，会出现此错误\mathversion{bold}。它指出某些字母的数学版本的定义bold无效。这是软件包中的一个错误。例如，这也会触发它：

\documentclass[preview]{standalone}

\usepackage{stix2}
\usepackage{amsmath}

\begin{document}
\boldmath\(x\)
\end{document}

\boldmath删除后警告也随之消失。

使用unicode-math可以解决上个世纪遗留的 8 位字体格式的难题。我建议您在可以时这样做，并在必要时在 PDFTeX 中解决这些问题。

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