if-then-else is also a rule, like any other operation.
Am Samstag, 11. November 2017 14:25:34 UTC+1 schrieb John Gabriel: > A function is defined to be ONE relation, not a thousand. > > A relation is a mapping or a rule. > > The first idiot who came up with the crap of a piece-wise function should have lost his job. It is a bogus concept. > > By its very definition, calculus only works given ONE continuous and smooth function. The moment you introduce monkey business to help you teach your shit of limits, differentiability and the ubiquitous crap such as abs(x) not being differentiable at x=0, then you are no longer dealing with calculus, but something else ... shit.