Not a typo; nor any mistake. You are so lost. :)

Yes, sinc(x) is non-negative definite, because its Fourier Tran
　
来源: career 于 2015-03-07 06:42:57 [档案] [转至博客] [旧帖] [给我悄悄话] 本文已被阅读：1 次 (212 bytes)
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回答: You are as right here as your "sinc(x) is NND". What a joke. 由 weston 于 2015-03-07 06:10:39
Yes, sinc(x) is non-negative definite, because its Fourier Transform, FT(sinc(x)), is non-negative.

If it sounds "joke" to you, you need to dust off your math textbook.

:)