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Rev 75965 Rev 78742
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    \code{x^{y + z}}  \tab invisible grouping of operands \cr
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    \code{x^{y + z}}  \tab invisible grouping of operands \cr
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    \code{group("(",list(a, b),"]")} \tab specify left and right delimiters \cr
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    \code{group("(",list(a, b),"]")} \tab specify left and right delimiters \cr
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    \code{bgroup("(",atop(x,y),")")} \tab use scalable delimiters \cr
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    \code{bgroup("(",atop(x,y),")")} \tab use scalable delimiters \cr
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    \code{group(lceil, x, rceil)} \tab special delimiters \cr
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    \code{group(lceil, x, rceil)} \tab special delimiters \cr
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    \code{group(lfloor, x, rfloor)} \tab special delimiters \cr
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    \code{group(lfloor, x, rfloor)} \tab special delimiters \cr
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    \code{group(langle, list(x, y), rangle)} \tab special delimiters \cr
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  }
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  }
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  The supported \sQuote{scalable delimiters} are \code{| ( [ \{},
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  The supported \sQuote{scalable delimiters} are \code{| ( [ \{}
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  \code{lceil}, \code{lfloor} and their right-hand versions.
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  and their right-hand versions.
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  \code{"."} is equivalent to \code{""}: the corresponding delimiter
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  \code{"."} is equivalent to \code{""}: the corresponding delimiter
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  will be omitted. Delimiter \code{||} is supported but has the same
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  will be omitted. Delimiter \code{||} is supported but has the same
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  effect as \code{|}.
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  effect as \code{|}.
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  The special delimiters \code{lceil}, \code{lfloor}, \code{langle}
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  (and their right-hand versions) are not scalable.
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  The symbol font uses Adobe Symbol encoding so, for example, a lower
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  The symbol font uses Adobe Symbol encoding so, for example, a lower
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  case mu can be obtained either by the special symbol \code{mu} or by
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  case mu can be obtained either by the special symbol \code{mu} or by
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  \code{symbol("m")}.  This provides access to symbols that have no
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  \code{symbol("m")}.  This provides access to symbols that have no
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  special symbol name, for example, the universal, or forall, symbol is
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  special symbol name, for example, the universal, or forall, symbol is