[anon946]

Agree. You could use the argument that argument against almost any teaching example. Like, when's the last time you ever needed to integrate x from 0 to 1? I've never needed to do that. Or when is the last time you needed to know how long a 1 kg ball will take to fall from 1 m? At least in my opinion, the way the author thinks recursion should be taught seems to needlessly complicate it.

[sideshowb]

I've done a few integrals of x from zero to one, they come up quite a bit if x is normalized.

Exception proves the rule, though ;-)