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 Dec 10 awarded Popular Question Jan 6 awarded Tumbleweed 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