Script-r Symbol

You may want to consult Dr. David J. Griffiths's web page at http://academic.reed.edu/physics/faculty/griffiths.html.

At the bottom of the page he provides a link "To create script-r in TeX:"

• http://academic.reed.edu/physics/faculty/griffiths/script_r.zip

EDIT: There's often a little too much whitespace after the glyph. If you want to reduce this, you can crop it by using these macros instead of the ones Griffiths suggests:

\def\rcurs{{\mbox{$\resizebox{.09in}{.08in}{\includegraphics[trim= 1em 0 14em 0,clip]{ScriptR}}$}}}
\def\brcurs{{\mbox{$\resizebox{.09in}{.08in}{\includegraphics[trim= 1em 0 14em 0,clip]{BoldR}}$}}}

If you are willing to use lualatex and unicode-math. At least you can get a free script font, XITS or Asana. They both have a script font and its bold version.

rsfs is a free script font. But there seems to be no bold version.

Any way the glyphs in XITS and Asana are not exactly what you want. But if you only want script fonts with bold version instead of exactly reproduce the look in that book, they should work.

\documentclass{article}
\usepackage{amsmath}
\usepackage{unicode-math}
\setmathfont{XITS Math}

\def\az{abcdefghijklmnopqrstuvwxyz}
\def\AZ{ABCDEFGHIJKLMNOPQRSTUVWXYZ}

\begin{document}
  \begin{gather*}
    \mathscr{\az} \\
    \mathscr{\AZ} \\
    \mathbfscr{\az} \\
    \mathbfscr{\AZ}
  \end{gather*}
\end{document}

In MathTime \mathbcal{\altr} gives:

But the font isn't free...

And, my opinion is, that alternative r on print, even in handwriting, doesn't read well.