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    \code{x \%prop\% y}  \tab x is proportional to y \cr
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    \code{x \%prop\% y}  \tab x is proportional to y \cr
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    \code{plain(x)}   \tab draw x in normal font \cr
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    \code{plain(x)}   \tab draw x in normal font \cr
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    \code{bold(x)}   \tab draw x in bold font \cr
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    \code{bold(x)}   \tab draw x in bold font \cr
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    \code{italic(x)}   \tab draw x in italic font \cr
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    \code{italic(x)}   \tab draw x in italic font \cr
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    \code{bolditalic(x)} \tab draw x in bolditalic font \cr
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    \code{bolditalic(x)} \tab draw x in bolditalic font \cr
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    \code{symbol(x)} \tab draw x in symbol font \cr
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    \code{list(x, y, z)} \tab comma-separated list \cr
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    \code{list(x, y, z)} \tab comma-separated list \cr
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    \code{...}    \tab ellipsis (height varies) \cr
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    \code{...}    \tab ellipsis (height varies) \cr
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    \code{cdots}   \tab ellipsis (vertically centred) \cr
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    \code{cdots}   \tab ellipsis (vertically centred) \cr
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    \code{ldots}   \tab ellipsis (at baseline) \cr
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    \code{ldots}   \tab ellipsis (at baseline) \cr
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    \code{x \%subset\% y} \tab x is a proper subset of y \cr
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    \code{x \%subset\% y} \tab x is a proper subset of y \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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  }
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  }
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  The symbol font uses Adobe Symbol encoding so, for example, a
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  Greek lower case mu can be obtained either by the special
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  symbol \code{mu} or by \code{symbol("m")}.  This provides
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  access to symbols that have no special symbol name, for example,
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  the universal, or forall, symbol is \code{symbol("\\042")}.
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  Note to TeX users: TeX's \code{\Upsilon} is \code{Upsilon1}, TeX's
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  Note to TeX users: TeX's \code{\Upsilon} is \code{Upsilon1}, TeX's
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  \code{\varepsilon} is close to \code{epsilon}, and there is no
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  \code{\varepsilon} is close to \code{epsilon}, and there is no
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  equivalent of TeX's \code{\epsilon}.  TeX's \code{\varpi} is close to
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  equivalent of TeX's \code{\epsilon}.  TeX's \code{\varpi} is close to
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  \code{omega1}.  \code{vartheta}, \code{varphi} and \code{varsigma} are
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  \code{omega1}.  \code{vartheta}, \code{varphi} and \code{varsigma} are
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  allowed as synonyms for \code{theta1}, \code{phi1} and \code{sigma1}.
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  allowed as synonyms for \code{theta1}, \code{phi1} and \code{sigma1}.