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\item[accents] accented expressions are specified using the special
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\item[accents] accented expressions are specified using the special
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mathematical functions {\tt hat} and {\tt bar}.  For example, {\tt
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mathematical functions {\tt hat} and {\tt bar}.  For example, {\tt
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hat(x)} produces $\hat x$ and {\tt bar(x)} produces $\bar x$.
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hat(x)} produces $\hat x$ and {\tt bar(x)} produces $\bar x$.
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\item[fractions] fractions are specified using the special
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\item[fractions] fractions are specified using the special
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mathematical function {\tt over}. For example, {\tt over(1,2)}
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mathematical function {\tt frac} (or its alias, {\tt over}).
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produces $1\over2$.
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For example, {\tt frac(1,2)} produces $1\over2$.
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\item[relations]  equality or assignment of terms is specified using
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\item[relations]  equality or assignment of terms is specified using
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the {\tt ==} relation.  For example, {\tt x == y} produces $x=y$.
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the {\tt ==} relation.  For example, {\tt x == y} produces $x=y$.
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\item[visible grouping]  terms are visibly grouped by placing them
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\item[visible grouping]  terms are visibly grouped by placing them