mutually recursive ==>
recursion
<mathematics, programming> When a function (or procedure) calls itself.
Such a function is called "recursive". If the call is via one or more other
functions then this group of functions are called "mutually recursive".
If a function will always call itself, however it is called, then it will never
terminate. Usually however, it first performs some test on its arguments to
check for a "base case"  a condition under which it can return a value without
calling itself.
The canonical example of a recursive function is factorial:
factorial 0 = 1
factorial n = n * factorial (n1)
Functional programming languages rely heavily on recursion, using it where
a procedural language would use iteration.
See also recursion, recursive definition, tail recursion.
[Jargon File]
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recursive acronym
