答案1
正如@Sebastiano 在评论中提到的,实际的字符很可能来自一种非免费提供的商业字体。但我不认为 Steenrod 将该字体用于任何其他字符,因此这里是使用calligraphy
。
我将新符号的高度设置为1.43ex
,大约与小写字母的高度相同t
。这就是它在我的书中的样子。您可以通过更改来调整字符的粗细scale=.5
。值越高,字符越细;值越低,字符越粗。
\documentclass{article}
\usepackage{tikz,graphicx}
\usetikzlibrary{calligraphy}
\newcommand{\BB}{\resizebox{!}{1.43ex}{\begin{tikzpicture}[scale=.5,baseline]
\calligraphy[copperplate] (0,.99) .. controls +(-.4,0) and +(.7,0) .. (-.3,0) [this stroke style={heavy}]
+(0,0) .. controls +(-.4,0) and +(-.5,0) .. (-.1,1) [this stroke style={light,taper=none}]
+(0,0) .. controls +(.6,0) and +(.5,0) .. (0,.53) [this stroke style={heavy}]
+(.2,.02) .. controls +(.5,-.2) and +(.25,-.3) .. (.05,.1) [this stroke style={heavy}];
\end{tikzpicture}}}
\begin{document}
\paragraph{Mappings of bundles.} Let $\BB$ and $\BB'$ be two coordinate bundles having the same fibre and the same group.
By a \emph{map} $h\colon\BB\to\BB'$ is meant a continuous map $h\colon B\to B'$ having the following properties
\end{document}