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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.