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seen Jul 9 '13 at 5:11

May
29
comment How to calculate: $\sum_{n=1}^{\infty} n a^n$
That's a good point. Rolled back.
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.
Jul
2
comment The Penroseā€“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.