7.3.3.3 Differences with LaTeX

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.