Crossing a symbol like p, similar to one like hbar

Question

I would like to cross a symbol like p, in math mode, similar to what we get for h by using \hbar, i.e. ꝑ (U+A751).

Picture in case of font problems:

What do you mean by "It should be clear where the cross should go on p"? \hbar has the [bar] running across the top due to the ascender in h. Should the [bar] run across the bottom in a p due to the descender? — Werner, May 12 '16 at 23:41
@Werner yes i think the OP must surely be picturing a p with a stroke through the vertical line, much as with ħ, or in other words, like ƀ reflected in the baseline. Here it is: ꝑ U+A751 — Au101, May 13 '16 at 00:02
@azetina, this gives a diagonal cross over the whole symbol. I want a horizontal line across the bottom as in Au101 comment. — passerby51, May 13 '16 at 01:23
@passerby51 I've edited your post to clarify, feel free to make any further edits as you see fit — Au101, May 13 '16 at 01:36

score 3 · Answer 1 · edited Apr 13 '17 at 12:35

3

Something similar has been defined by @egreg in this post. But here is a customized command:

\newcommand{\pbar}{\lower1.5ex\hbox{$\mathchar'26$}\mkern-6mu p}

Here is mwe:

\documentclass{article}
\newcommand{\pbar}{\lower1.5ex\hbox{$\mathchar'26$}\mkern-6mu p}
\begin{document}
$\pbar$ {\large$\pbar$} {\huge$\pbar$}
\end{document}

Here is another take at the symbol. The extra horizontal space can be addressed with a \!. The vertical space has been accounted for by keeping the original height and setting the depth to 0pt.

\newcommand{\pbar}{\raisebox{-1.5ex}[\height][0pt]{$\mathchar'26$}\mkern-6mu p}

edited Apr 13 '17 at 12:35

Community

1

answered May 13 '16 at 01:36

azetina

28,884

thanks. This seems good. A minor issue is that there is extra space before the symbol. Try for example \log \pbar. – passerby51 May 13 '16 at 16:36
Also, extra space below it seems: Try \frac{\log \pbar}{n} – passerby51 May 13 '16 at 16:45
@passerby51 See the updated code. Alternatively there exists the \smash command. – azetina May 13 '16 at 17:23

score 3 · Answer 2 · answered May 13 '16 at 18:01

The symbol has a Unicode code point:

U+A751 LATIN SMALL LETTER P WITH STROKE THROUGH DESCENDER

There are some (at least) text fonts, which do provide the symbol. Example for LuaTeX/XeTeX:

\documentclass{article}
\usepackage{booktabs}
\usepackage{fontspec}
\newfontfamily\DejaVuSans{DejaVu Sans}
\newcommand*{\Rows}{}
\makeatletter
\newcommand*{\TestFamily}[1]{%
  \expandafter\newfontfamily\csname FONT@#1\endcsname{#1}%
  \g@addto@macro\Rows{\RowFamily{#1}}%
}
\newcommand*{\TestSingle}[1]{%
  \expandafter\newfontfamily\csname FONT@#1\endcsname{#1}%
  \g@addto@macro\Rows{\RowSingle{#1}}%
}
\newcommand*{\RowFamily}[1]{%
  #1 & \csname FONT@#1\endcsname\symbol{"A751}
     & \csname FONT@#1\endcsname\bfseries\symbol{"A751}
     & \csname FONT@#1\endcsname\itshape\symbol{"A751}
     & \csname FONT@#1\endcsname\bfseries\itshape\symbol{"A751}
  \tabularnewline
}
\newcommand*{\RowSingle}[1]{%
  #1 & \csname FONT@#1\endcsname\symbol{"A751}
  \tabularnewline
}
\TestFamily{DejaVu Sans}
\TestSingle{Quivira}
\TestFamily{Segoe UI}
\TestFamily{FreeSerif}
\makeatother
\begin{document}
\begin{tabular}{lllll}
  \toprule
  Name & Regular & Bold & Italic & Bold Italic\\
  \midrule
  \Rows
  \bottomrule
\end{tabular}
\end{document}

The symbol could then be used inside math via \text{\symbol{"A751}} (package amstext or amsmath).

à propos DejaVu Sans: with current TL2016, LuaTeX 0.95 + luaotfload end up using the Condensed font. Not the case with TL2015 or xelatex. — , May 13 '16 at 18:17

score 2 · Answer 3 · answered May 13 '16 at 17:41

2

The width of the bar is 9mu, so we need such amount of back up.

Here's a version that works also in sub/superscripts and has no spacing issues.

\documentclass{article}
\usepackage{amsmath}

\makeatletter
\DeclareRobustCommand{\pbar}{\mathord{%
  \text{$\m@th\mkern-2mu\raisebox{-1.5ex}[0pt][0pt]{$\mathchar'26$}\mkern-7mu p$}%
}}
\makeatother

\begin{document}
$a\pbar_{\pbar_{\pbar}}\hbar$

$ap$

\end{document}

answered May 13 '16 at 17:41

egreg

1,121,712

I was working on the horizontal spacing when I saw your post. Great job at addressing the extra spaces. – azetina May 13 '16 at 17:47
Can you add this link just as reference to what \m@th does and what it is? http://tex.stackexchange.com/a/153398/10898 – azetina May 14 '16 at 16:06

Crossing a symbol like p, similar to one like hbar

3 Answers3