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Jan 28, 2012 at 15:56 comment added Eugen Keil I think I got it correct. It is the number of solutions to $b_im = b_in$ for $n,m \leq N$, which is $N$ (if $b_i \neq 0$). The maximum is taken over $i = 1,2,3$, not over $y$. This might have confused you.
Jan 28, 2012 at 11:45 comment added Tal H Thank you very much. Perhaps I'm wrong here, but by Parseval's identity we get $$\int_{-\frac{1}{2}}^{\frac{1}{2}}\text {max}\left(|u_{i}\left(y\right)|^{2}\right)dy\leq N^{2}$$ Don't we? I mean, with $N^2$ instead of $N$...
Jan 26, 2012 at 10:03 history answered Eugen Keil CC BY-SA 3.0