Gerard
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 Mar 8 revised Can a 4-d quadric in $\mathbb{P}_5$ contain a $\mathbb{P}_3$? edited tags Mar 8 asked Can a 4-d quadric in $\mathbb{P}_5$ contain a $\mathbb{P}_3$? Mar 6 comment Proof that Möbius tranformations are conformal Yes I see. Still these arguments do not take the conservation of perpendicularity as the departing point of view. Mar 6 asked Proof that Möbius tranformations are conformal Jan 14 comment Quadratic equation in $z$ and $\overline{z}$ in the complex plane The first equation is a circle when the coefficients before $x$ and $y$ are equal and also the real part of $\delta$ must be smaller then the product of these coefficients. Still the empty set, or when it is a circle perhaps two points, is probably right. Jan 13 comment Quadratic equation in $z$ and $\overline{z}$ in the complex plane It would be a contradiction with the form $|z+\beta|=R$. Your A and B are not real numbers anymore, unless $\gamma=\overline{\beta}$. Jan 13 asked Quadratic equation in $z$ and $\overline{z}$ in the complex plane Nov 24 awarded Popular Question Nov 2 awarded Popular Question Oct 5 revised Transitive relation vs. transitive action added 158 characters in body Jun 27 comment Four questions about finite fields @MarkBennet see my edit Jun 27 revised Four questions about finite fields added 202 characters in body Jun 27 asked Four questions about finite fields May 26 asked Transitive relation vs. transitive action Apr 1 comment Visual understanding for “the genus” of a plane algebraic curve Your first sentence is rather complex, how on earth may that be visualised, or: is there any connection of that remark to the Riemann sphere? Apr 1 comment Visual understanding for “the genus” of a plane algebraic curve How about the relation of the other Cassini curves to the Riemann sphere? Apparatnly they cannot be parametrized - or? Apr 1 comment Visual understanding for “the genus” of a plane algebraic curve This explains why the lemniscate is of genus 0, while the others are of genus 1. Apr 1 asked Visual understanding for “the genus” of a plane algebraic curve Mar 30 asked Relation between curvature of curve and dual curve? Mar 28 comment A 4th grade curve meets a line in one point with multiplicity 4 The curve $x^3=y^2$ and line $y=0$ has a multiplicity of intersection 3. But the origin $(0,0)$ is a cusp.