Thanks, Allan. I see that now. --Dan On 2013-07-23, at 10:10 AM, Allan Wechsler wrote:
I think, as you have phrased it, that the answer is "no"; the locus is two circular arcs whose tangents meet at 60 degree angles; it looks like a pointy American football.
On Tue, Jul 23, 2013 at 1:02 PM, Dan Asimov <dasimov@earthlink.net> wrote:
Let P = (-1,0) and Q = (1,0) in the plane.
Let L be the locus of all points X such that the angle PXQ is 120 degrees.
Include in L the points P and Q as well.
QUESTION: Does L have a well-defined tangent line at P and Q ??? (And if so, is it C^oo or C^w (real analytic) at P and Q as well?)
--Dan
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun