(a2ps.info)Differences with LaTeX

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7.3.3.3 Differences with LaTeX
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The following symbols, inherited from the style sheet 'Symbol', are not
supported by LaTeX:

   '\Alpha', '\apple', '\Beta', '\carriagereturn', '\Chi', '\Epsilon',
'\Eta', '\florin', '\Iota', '\Kappa', '\Mu', '\Nu', '\Omicron',
'\omicron', '\radicalex', '\register', '\Rho', '\suchthat', '\Tau',
'\therefore', '\trademark', '\varUpsilon', '\Zeta'.

   LaTeX is more demanding about special symbols.  Most of them must be
in so-called math mode, which means that the command must be inside '$'
signs.  For instance, though
     If \forall x \in E, x \in F then E \subseteq F.

is perfectly legal in PreTeX, it should be written
     If $\forall x \in E, x \in F$ then $E \subseteq F$.

for LaTeX.  Since in PreTeX every '$' is discarded (unless quoted by a
'\'), the second form is also admitted.