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May 17, 2013 at 22:17 comment added András Bátkai A related question: mathoverflow.net/questions/130276/mathcald0-tv-is-dense-in-w0-t
May 17, 2013 at 13:57 answer added Jochen Wengenroth timeline score: 2
May 17, 2013 at 13:47 comment added Jochen Wengenroth @MTS: $C_c^\infty(K) = \lbrace f\in C^\infty(\mathbb R): \mathrm{supp}(f) \subseteq K\rbrace$.
May 17, 2013 at 13:16 comment added MTS Isn't it superfluous to require compact support, given that the domain is a compact interval?
May 17, 2013 at 11:57 comment added André Henriques Convolution with a smooth compactly supported bump function?
May 17, 2013 at 11:47 history asked James F CC BY-SA 3.0