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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
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within parentheses.  For example, {\tt (x+y)} produces $(x+y)$.
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within parentheses.  For example, {\tt (x+y)} produces $(x+y)$.
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\item[invisible grouping]  terms are invisibly grouped by placing
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\item[invisible grouping]  terms are invisibly grouped by placing
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them within curly braces. For example {\tt x\^{}\{2*y\}} produces
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them within curly braces. For example \verb|x^{2*y}| produces
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$x^{2y}$, whereas {\tt x\^{}2*y} produces $x^2y$.
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$x^{2y}$, whereas {\tt x\^{}2*y} produces $x^2y$.
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\item[big operators]  a sum, product, or integral is specified using
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\item[big operators]  a sum, product, or integral is specified using
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the special mathematical function of the corresponding name.  Each
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the special mathematical function of the corresponding name.  Each
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of these functions takes three arguments;  the first indicates what
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of these functions takes three arguments;  the first indicates what