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  formatted according to TeX-like rules.  Expressions can also be used
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  formatted according to TeX-like rules.  Expressions can also be used
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  for titles, subtitles and x- and y-axis labels (but not for axis
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  for titles, subtitles and x- and y-axis labels (but not for axis
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  labels on \code{persp} plots).
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  labels on \code{persp} plots).
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  In most cases other language objects (names and calls, including
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  In most cases other language objects (names and calls, including
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  formulas) are coerced to expressions and so can also be used.  }
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  formulas) are coerced to expressions and so can also be used.
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}
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\details{
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  \details{ A mathematical expression must obey the normal rules of
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  A mathematical expression must obey the normal rules of syntax for any
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  syntax for any \R expression, but it is interpreted according to very
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  \R expression, but it is interpreted according to very different rules
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  different rules than for normal \R expressions.
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  than for normal \R expressions.
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  It is possible to produce many different mathematical symbols, generate
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  It is possible to produce many different mathematical symbols, generate
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  sub- or superscripts, produce fractions, etc.
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  sub- or superscripts, produce fractions, etc.
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  The output from \code{demo(plotmath)} includes several tables which
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  The output from \code{demo(plotmath)} includes several tables which