Timeline for Is there a $C_c^{\infty}( \mathbb{R}^d)$ function whose Fourier transform we can explicitly write down?
Current License: CC BY-SA 3.0
5 events
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| Apr 24, 2016 at 20:30 | comment | added | Piero D'Ancona | Nice. This is done in great generality in Theorem 1.3.5 in the first volume of Hormander's book. By the same trick one can construct compactly supported functions with higher degree of smoothness | |
| Apr 24, 2016 at 9:19 | comment | added | Ben McKay | For the lazy, $\operatorname{sinc} x=\sin(\pi x)/(\pi x)$. | |
| Apr 24, 2016 at 6:47 | comment | added | Ben McKay | @FanZheng: en.wikipedia.org/wiki/Sinc_function | |
| Apr 24, 2016 at 6:27 | comment | added | Fan Zheng | Could you explain what is sinc? | |
| Apr 24, 2016 at 5:36 | history | answered | Terry Tao | CC BY-SA 3.0 |