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 Apr 28 comment Find particular pair of values that satisfy equation How do you order ordered pairs? Apr 26 answered Show that any conjugate pair of complex numbers (with non-zero imaginary part) cannot be the spectrum of any 2x2 matrix with real, nonnegative entries Apr 26 comment On a certain series of cosines When p > q, there will be more terms. For p < q, you are right. Apr 26 asked On a certain series of cosines Apr 24 comment Computation of an inverse trigonometric series using complex numbers The students do not know integration right now. And certainly complex analysis is not in the syllabus. I like the solution though, thanks! Apr 24 asked Computation of an inverse trigonometric series using complex numbers Apr 11 awarded Nice Question Dec 25 accepted The equation of a pair of tangents to a circle from a point. Nov 17 awarded Inquisitive Nov 16 asked Arnold's combinatorial description of entropy. Nov 14 comment Exercise 1.2.4 (From Grimmett and Stirzaker) Did you try using the definitions? Can you state what you have to prove in order to show that G is closed under complementation? Oct 28 answered ABC a triangle with orthocenter and circumcenter at (9,5) and (0,0) respectively if equation of side BC is 2x-y=1 , then find possible coords of A? Oct 20 comment The equation of a pair of tangents to a circle from a point. I did not follow the derivative-tangent argument. Why should the equality of the curve equation's derivative imply tangency? Oct 19 comment The equation of a pair of tangents to a circle from a point. I am talking about the equation of pair of tangents to circle through a point P. See iit-jee-maths.blogspot.in/2008/12/… Oct 17 accepted Plucker's $\mu$ Oct 17 asked The equation of a pair of tangents to a circle from a point. Oct 16 comment Plucker's $\mu$ I got motivated to read geometry after reading Felix Klein's "Elementary Mathematics from an Advanced viewpoint: Geometry". Perhaps it is the same book. I forgot to revisit that book. Thanks for this proof. Now I appreciate the Plucker trick a little more. I wish there even more examples! Oct 15 comment Plucker's $\mu$ Thank you. I knew that in the complex projective plane they will always intersect at the "right" number of points. But I want to know if there is a "real" meaning to those conics that intersect at those 4 complex points? The point about tangency is cool. Thanks! Oct 15 asked Plucker's $\mu$ Oct 13 revised Theory and problems book in euclidean, affine, and projective geometry fixed grammar