About Map/Keep/Combine

Of course, copying the list is also O(n) time. I guess I shouldn't worry about this.

a question: shouldn't this be in the general cs section instead of the math section?

We have (as usual, sigh) hijacked a thread here. The OP is a mathematician interested in the use of functional programming to teach math. That's what her paper is about.

Why am I seeing a lot of French here?

...because the topic owner is French?