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I was asked the following question:

How do I get get \pitchfork in plain TeX?

He tried \input mssymb and \input amssymb but neither works. More generally, is it possible to get ams symbols to work under plain TeX?

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1 Answer

up vote 6 down vote accepted

Sure,

\input amssym
$\pitchfork$
\bye

If one doesn't need all of the ~200 new control sequences, but only the additional fonts (ie. \frak for fraktur and \Bbb for blackboard bold), and a few extra symbols (see amsfndoc [PDF], p. 18–19), one can just load the amssym.def. (Note, however, that the \pitchfork symbol is not included in amssym.def.)

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5  
actually, amssym.tex loads amssym.def, so you need only the one line, \input ammsym. –  barbara beeton Sep 15 '11 at 18:28
    
@barbara: thanks, I corrected my answer. –  morbusg Sep 15 '11 at 19:00
    
This works on my system. Thank you! –  Sam Nead Sep 15 '11 at 22:25
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