What if we utilized a type representing exclusively infinite lists, rather than possibly infinite ones? Then partial_fixpoint could not be directly applied to define recursive functions for this type, as its partial order lacks a least element. A workaround exists, analogous to the method for defining F91 in Lean: we can demonstrate that Stream.map preserves infiniteness and constrain its input and output types to infinite lists only. Implementing this concept remains a challenge for now, but it may be explored in a subsequent article.
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研发团队：规模扩张与核心稳定的悖论
fib_helper {n=n - 1; a=a + b; b=a}
while (y != 0) {