IBM 5100

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The 4> Function: Reverse, Rotate OJ m
The ¢ symbol is formed by overstriking the 0 symbol and the I symbol. A special
form of the function symbol is 9, formed by overstriking the 0 symbol and the -
symbol.
Monadic (One-Argument) Form: Reverse <p [I] B or <f>;B or aB
The reverse function reverses the elements of argument B. Argument B can be any
expression.
89