From: Yuli Rudyak Date: Thu, 11 Nov 2004 16:25:42 -0500 (EST) I have a question for the list. Can somebody tell me where can I find a simple proof of the Whitney Theorem on immersions of the circle into the plane (the class of regular homotopy is completely determined by the winding number). I need some text book or survey paper, easy enough for graduate students. Yuli Dr. Yuli B. Rudyak Department of Mathematics University of Florida 358 Little Hall PO Box 118105 Gainesville, FL 32611-8105 USA TEL: (+1) 352-392-0281 ext. 319(office) TEL: (+1) 352-381-8497(home) FAX: (+1) 352-392-8357 URL: http://www.math.ufl.edu/~rudyak/