Due to the declarative nature of~TAME, recursive operations needing to step are~not all that common. These operations are useful when converting between 1-indexed and 0-indexed data. \ref{_inc_} increments a value by a~single step (default~1). \ref{_dec_} decrements a value by a~single step (default~1).
Negation is a common task and it was tedious in older versions of TAME\footnote{Before it was even called TAME, actually.} For these situations, \ref{NEGATE} is provided to avoid having to use a~\ref{const} expression. To avoid a {\tt product} expression altogether, use~\ref{_negate_}.