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The monadic operator null () is used to aid in resolving ambiguities with slash/slope as a function/operator.

That is, if the parser has trouble with a phrase using slash/slope where you mean that symbol to be a function, but the parser interprets it as an operator, or worse yet signals a SYNTAX ERROR, try using the Null operator.

For example, in L+//R the interpreter parses the lefthand slash as an operator whose derived function is +/. If you mean that symbol to be a function, use L+/⊙/R which forces the lefthand slash to be interpreted as a function. Alternatively, that line could be written as L+(//R).