Returns fixed point of a function
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fp::fixedpt(f) returns the fixed point of
the unary function
fp::fixedpt is implemented as the Y combinator
which is defined as follows:
where the function g is defined as
A function computing the Fibonacci numbers is created as a fixed point:
fb2 := (f,n) -> if n <= 2 then 1 else f(n-1) + f(n-2) end: fib := fp::fixedpt(fp::curry(fb2)): fib(i) $ i=1..9