/sci/ - Science & Math

>>11618989
Ok so:
(25) Ye makes sense, I didnt think of it because I started with log and then tried with the inverse of log, and in my clg all logs would be considered of e, we wouldnt have log of 4 on a base of 3 for example, but I know what it is from HS;
(27) Got it
(30) I think I forgot to mention my main question: [redacted for rambling], so after seeing question 29 I understand, but does f: S -> S mean that all elements of S are used in both size? What does it mean for S to map into itself? It means that f(S) is contained in S, but doesnt mean that f(S) = S, otherwise it would mean its onto, right?