Richard Zach

Strict Conditional in LaTeX

I just had occasion to have to typeset Lewis’s strict conditional symbol <img src="http://plato.stanford.edu/archives/win2004/symbols/fishhook.gif" alt="- in LaTeX. It turns out it isn’t in the standard AMS fonts. Peter Smith’s LaTeX for Logicians to the rescue! There I found:

  1. that the strict conditional symbol is in the fonts that are part of the txfonts and pxfonts packages, and
  2. that there is a wonderful 110 page/3 MB comprehensive listing of all LaTeX symbols (by Scott Pakin).

Now it turns out that the point of txfonts and pxfonts is to give you output in Times Roman and Palatino fonts, respectively, with matching math and symbol fonts. That’s useful in itself–but if you happen to not want your document to be in Times or Palatino, you can still get \strictif by putting this in the preamble:

\DeclareSymbolFont{symbolsC}{U}{txsyc}{m}{n}
\DeclareMathSymbol{\strictif}{\mathrel}{symbolsC}{74}

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6 responses to “Strict Conditional in LaTeX”

  1. lumpy pea coat

    Good to know!

    Reply
  2. Anonymous

    That’s helpful! Is there a similar trick for typesetting the `box arrow’ symbol that is sometimes used for the counterfactual conditional? I think it’s called `\boxright’ in pxfonts/txfonts.

    Reply
  3. Richard Zach

    Just look up the font and symbol declarations in txfonts.sty:\DeclareMathSymbol{\boxright}{\mathrel}{symbolsC}{128}

    Reply
  4. Peter Smith

    I’ve added (with acknowledgement!) your code for using symbols extracted from txfonts to LaTeX for Logicians. Thanks for that!

    Reply
  5. google

    ahuenno!

    Reply
  6. Anonymous

    Great! Any thoughts on how to do this for use with XeLaTeX instead? Thanks!

    Reply

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