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  The shorthand form \code{\\(x) x + 1} is parsed as \code{function(x) x
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  The shorthand form \code{\\(x) x + 1} is parsed as \code{function(x) x
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    + 1}. It may be helpful in making code containing simple function
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    + 1}. It may be helpful in making code containing simple function
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  expressions more readable.
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  expressions more readable.
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}
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}
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\note{ \bold{The shorthand function notation is experimental and may change
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    prior to release.} }
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\section{Technical details}{
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\section{Technical details}{
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  This type of function is not the only type in \R: they are called
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  This type of function is not the only type in \R: they are called
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  \emph{closures} (a name with origins in LISP) to distinguish them from
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  \emph{closures} (a name with origins in LISP) to distinguish them from
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  \link{primitive} functions.
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  \link{primitive} functions.
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