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Aug 4, 2010 at 22:01 comment added Petya Thank you! I also stared on your comment for a few minutes! But now I understand.
Aug 3, 2010 at 20:36 comment added Willie Wong Petya, I hope you don't mind my minor edit. I stared at your post for a full five minutes before I understood that you didn't mean to define $e$ as $\sum 1/i! \sin(n!\pi x)$...
Aug 3, 2010 at 20:35 history edited Willie Wong CC BY-SA 2.5
added a few words to prevent confusion
Aug 3, 2010 at 15:21 comment added Petya Moreover, it easily generalizable to $\sum_{i\in I}1/i!$, where $I$ is any infinite subset of $\mathbb N$. That gives us a continuum points in $\mathbb R / \mathbb Q$.
Aug 3, 2010 at 13:24 comment added Pietro Majer also note that the sequence $\sin(\pi xn!)$ only changes by finitely many terms if a rational is added to $x$; so in particular 2) holds in a dense set.
Aug 3, 2010 at 12:30 history answered Petya CC BY-SA 2.5