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seen Sep 19 at 3:35

May
29
awarded  Nice Question
May
29
revised How to calculate: $\sum_{n=1}^{\infty} n a^n$
deleted 242 characters in body
May
29
revised How to calculate: $\sum_{n=1}^{\infty} n a^n$
deleted 242 characters in body
May
29
revised How to calculate: $\sum_{n=1}^{\infty} n a^n$
rolled back to a previous revision
May
29
revised How to calculate: $\sum_{n=1}^{\infty} n a^n$
rolled back to a previous revision
May
29
revised How to calculate: $\sum_{n=1}^{\infty} n a^n$
added 248 characters in body
May
29
awarded  Cleanup
May
29
comment How to calculate: $\sum_{n=1}^{\infty} n a^n$
That's a good point. Rolled back.
May
29
revised How to calculate: $\sum_{n=1}^{\infty} n a^n$
rolled back to a previous revision
May
29
comment How to calculate: $\sum_{n=1}^{\infty} n a^n$
Edited to do the summation from 0, not 1. Better reflects what I'm trying to work out.
May
29
awarded  Editor
May
29
revised How to calculate: $\sum_{n=1}^{\infty} n a^n$
deleted 28 characters in body
May
29
asked How to calculate: $\sum_{n=1}^{\infty} n a^n$
Jul
2
awarded  Student
Jul
2
comment The Penrose–Lucas argument
Mahmud: I'm more interested in the mathematics behind the statement, as in whether certain proofs can not be generated by an algorithm. I believe that's purely a mathematical question, not a philosophy one.
Jul
2
asked The Penrose–Lucas argument