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 Dec25 accepted Can fourier transform of a function with not empty support be zero on whole range? Dec25 asked Can fourier transform of a function with not empty support be zero on whole range? Nov10 awarded Supporter Nov7 awarded Scholar Nov7 accepted SPPS for Sturm-Liouville problems proof (Weierstrass M-test) Nov7 answered SPPS for Sturm-Liouville problems proof (Weierstrass M-test) Nov5 awarded Teacher Nov5 answered 3D graphic in vector format Nov5 comment Foci of Ellipse - given: Width and Height If ellipse and rectangle have four contact points: translate and maybe rotate an ellipse to situate its center in $(0,0)$, and then $a = p / 2$, $b = s / 2$ (or vice versa). If you need positions of foci as vectors, make inverse translation and rotation. If there are less than four contact points, there are infinity of solutions. Nov5 comment Foci of Ellipse - given: Width and Height Excuse me, what are the wigth and the height then? Nov5 awarded Editor Nov5 awarded Student Nov5 revised SPPS for Sturm-Liouville problems proof (Weierstrass M-test) added 1 characters in body Nov5 answered Foci of Ellipse - given: Width and Height Nov5 asked SPPS for Sturm-Liouville problems proof (Weierstrass M-test)