This is the first part of an intermittent series of articles about calculating Fibonacci numbers in F#. Each article will present a different kind of implementation. Where available, I will also show a corresponding implementation in C#. Step 1: Specification To be truly infite, the sequence has to satisfy three conditions: it has to be lazy, i.e., the numbers are not cached, but continually generated, the type of number must not have an upper boundary, and the algorithm must never cause a[...]