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Sep
8
comment We can divide $7^{17} - 7^{15}$ by?
7^17 - 7^15 = 7^2 * 7^15 - 1 * 7^15 = (7^2 - 1) * 7^15
Sep
8
comment We can divide $7^{17} - 7^{15}$ by?
7^17 - 7^15 = (7^2 - 1) * 7^15 = (49 - 1) * 7^15 = 48 * 7^15. No division required.
Sep
8
awarded  Enthusiast
Sep
3
awarded  Commentator
Sep
3
comment Collinear points theorem
@moron: No I hadn't tried it first, but at least it looks like I'm pretty good at choosing a title for my question! :-) Thanks for the link. +1
Sep
3
accepted Liouville's number revisited
Sep
3
awarded  Scholar
Sep
3
accepted Collinear points theorem
Sep
3
comment Collinear points theorem
Looks like AC and DF don't even have to be parallel.
Sep
3
comment Collinear points theorem
That's it, thanks. Problem is that you can only google it if you know what it's called!
Sep
3
asked Collinear points theorem
Aug
28
comment How to explain Real Big Numbers?
IMO your RSA example is exactly the problem: at least some people seem to think they can grasp 10^500. I was wondering how to explain the magnitude of such a number such that they might have an aha-experience (or maybe uh-oh).
Aug
28
revised How to explain Real Big Numbers?
added 4 characters in body
Aug
28
revised How to explain Real Big Numbers?
added 84 characters in body; added 16 characters in body
Aug
28
asked How to explain Real Big Numbers?
Aug
28
awarded  Student
Aug
28
comment Is it possible to represent every huge number in abbreviated form?
I count 521 digits in the larger number
Aug
28
asked Liouville's number revisited
Aug
28
revised What is $\sqrt{i}$?
added 53 characters in body
Aug
27
comment What is $\sqrt{i}$?
@Agusti - I don't see this link to the intro to LaTex, but I can find this elsewhere on the 'Net. I tried replacing "pi" with "\pi" but the symbol doesn't appear. Is there something else I should know?