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brainjam

mainly geometry -- euclidean, hyperbolic, projective, conformal, computational.

My gravatar image is a hyperbolic symmetry

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  • Toronto, Canada
  • brainjam.ca
  • Member for 10 years, 6 months
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21 Does there exist a circle with EXACTLY two rational points, no more, no less? Jan 7
7 For a recursion based on $x+y+z+2\sqrt{xy+yz+zx},$ does what happens in $\mathbb Z[\sqrt n]$ stay in $\mathbb Z[\sqrt n]$? Dec 17 '20
6 Is there a geometric construction that finds the intersection of two conics, given only five points on each? Aug 7 '19
6 Is there a name or a reference for these aperiodic rhomboidal tilings? May 17 '18
5 Is there an explanation for the patterns formed by the binomial coefficients $\binom{n+d-1}{d}\pmod{512}$? Sep 22 '10
5 Polygonal billiards and uniform distribution Oct 4 '10
5 Let $A=(-1,0),B=(1,0), C$ be points in $\mathbb{R}^2.$ What is the locus of points $\{s\in\mathbb{R}^2:C$ lies on the angle bisector of $AsB$}? Feb 7
4 If the line at infinity is a secant line of a conic then the conic is a hyperbola? Dec 17 '20
4 What geometrical construction can be done with help of conics which aren't possible with compasses and rulers? Aug 27 '20
4 Demonstration of the impossibility to draw a parallel through a point using only a straightedge. Nov 29 '20
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