Re: What does != mean
The proper proof is
0.99999...
= 9/10 + 9/100 + 9/1000 + ...
= sum( 9/10^i ), over i = 1 to infinity
= sum( 9/10 * 1/10^i ), over i = 0 to infinity
= (9/10) / (1 - 1/10), the sum of a geometric series
= (9/10) / (9/10)
= 1
[img]/images/graemlins/grin.gif[/img]
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