user avatar
user avatar
user avatar
brainjam
  • Member for 11 years, 10 months
  • Last seen this week
7 votes
1 answer
143 views

Is there a name or a reference for these aperiodic rhomboidal tilings?

7 votes
2 answers
275 views

Is there a geometric construction that finds the intersection of two conics, given only five points on each?

7 votes
4 answers
188 views

For a recursion based on $x+y+z+2\sqrt{xy+yz+zx},$ does what happens in $\mathbb Z\left[\sqrt n\right]$ stay in $\mathbb Z\left[\sqrt n\right]$?

7 votes
1 answer
211 views

Show that the locus of a point in this geometric construction is a conic

5 votes
1 answer
271 views

Is there an explanation for the patterns formed by the binomial coefficients $\binom{n+d-1}{d}\pmod{512}$?

5 votes
3 answers
695 views

Polygonal billiards and uniform distribution

4 votes
1 answer
66 views

Conic chords projected by point $P$ form a quadrilateral whose vertex pairs are collinear with $P$

4 votes
0 answers
146 views

Synthetic construction of common self-polar triangle for two non-intersecting ellipses

4 votes
1 answer
54 views

Reference request: A specific book on homotopy and covering spaces

3 votes
1 answer
104 views

Polynomial root finders with consistent root ordering

2 votes
1 answer
76 views

How many irrationals $x$ appear infinitely often in this set of open intervals?

2 votes
0 answers
99 views

Combinatorial analog of holonomy on a planar graph with quadrilateral faces

1 vote
2 answers
552 views

Complete quadrilateral: projective version of Newton-Gauss line

0 votes
1 answer
69 views

Jacobi sn: Does $w=\operatorname{sn}(z,m)$ send the line $\operatorname{Im}(z)=K'/2$ to the circle $\left \|w^4 \right \|=1/m?$

0 votes
3 answers
129 views

Elementary examples of pointwise sequential closures that are not pointwise closed

0 votes
2 answers
155 views

Uniform closures are uniformly closed but pointwise closures might not be pointwise closed

0 votes
1 answer
115 views

Errata for $\mathrm{\TeX}$ version of Thurston's 'The Geometry and Topology of Three-Manifolds'

0 votes
1 answer
28 views

Ratio of products of line segments