[loup-vaillant]

OK, I misread you.

That said, I tested both OO an FP, and my current opinion is that thinking more mathematically (in terms of sets, mappings…), almost always yields smaller designs, which are almost always more flexible and more efficient.

> By the way, "sets, mappings, graphs, combinators" is a pretty strange definition for a set. The element descriptions are vague and some of them seem unrelated to the others. That may be mathematically correct, but it doesn't make for a great argument.

I don't understand you here. Derefr didn't make any mathematical statement. He didn't described the concepts, he named them. The four items he mentioned are related. And why should they, anyway? The way I see it, Derefr just made a statement, not an argument.