Interesting group extension to the thrackle idea, (at the end of the page). http://www.users.globalnet.co.uk/~perry/maths/thrackle/thrackle.htm Jon Perry ...
64
equation300
Nov 22, 2002 1:46 pm
I was wondering if anyone in the group could help resolve this matter finaly. Althouthg i have found a sort of proof (x-1)(x+1) the problem was two fold...
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Jon Perry
jon_perryuk
Nov 22, 2002 8:53 pm
Another counter-example: http://www.users.globalnet.co.uk/~perry/maths/barnette/barnette.htm See 'Latest counter-example', 4th graph down. Jon Perry ...
66
Paul Erlich
emotionaljou...
Nov 27, 2002 7:56 pm
... matter ... problem ... i don't understand the question. can you elaborate please?...
67
robstrange66
Nov 28, 2002 2:03 pm
Hi all - I've updated my website - http://www.astro-logix.com - plenty of new shapes, including DNA helixes, instructions for building larger glow in the dark...
68
Jon Perry
jon_perryuk
Nov 29, 2002 6:14 pm
at: http://www.users.globalnet.co.uk/~perry/maths/hamiltoniancycles3/hamiltonian cycles3.htm Jon Perry perry@... ...
69
equation300
Dec 6, 2002 11:54 am
I realy should have deffined the question i guess.After searching for a way to remember the position of a given number effectively any number that you care to...
70
Paul Erlich <paul@...
emotionaljou...
Dec 8, 2002 3:07 am
i need 3D coordinates of vertices, preferably for the figure with 60 isosceles triangles each with height:base = 5:6. then i can show what the map looks like...
71
paul26e <Paul26e@....
paul26e
Dec 10, 2002 6:20 pm
Hello all, I've just joined this group and thought I'd plunge in with a question: Is there a good or elegant way to plaid the surface of a tetrahedron (or any...
72
Edward Moore
emoore06905
Dec 10, 2002 8:37 pm
My solution to this is to alter your view of why plaiding a cube works. The stripes are not just perpendicular to each other, they are parallel to the edges....
73
green@...
Dec 10, 2002 9:56 pm
paul, here's a woven stellated octahedron i made. perhaps it will show you some new ways in which to find more such polyhedral weavings. -melinda...
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dan duddy
polychoron
Dec 11, 2002 7:32 pm
--a bit related to the plaid polyhedra idea-- Jay Bonner created an amazing paper polyhedra kit called Geodazzlers which neatly pop out of preforated pages and...
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Paul K
paul26e
Dec 12, 2002 1:53 pm
Thanks for all the responses to my question! I'm intending to use strips of clay, by the way, around a paper polyhedron. The kiln will burn off the paper and...
76
Jon Perry
jon_perryuk
Dec 13, 2002 6:18 pm
Anyone know of a proof that a square/rectangle cannot be divided into entirely right-angled triangles, such that no smaller square/rectangle is produced? Jon...
77
Jon Perry
jon_perryuk
Dec 13, 2002 6:20 pm
(doesn't gel that well) Anyone know of a proof that a square/rectangle cannot be divided into entirely right-angled triangles, such that no square/rectangle is...
78
Jon Perry
jon_perryuk
Dec 13, 2002 6:23 pm
Anyone know of a proof that a square/rectangle cannot be divided into entirely right-angled triangles, such that no square/rectangle is produced by a 2 of the...
79
Jon Perry
jon_perryuk
Dec 13, 2002 6:24 pm
Anyone know of a proof that a square/rectangle cannot be divided into entirely right-angled triangles, such that no square/rectangle is produced by any 2 of...
80
berglunddj@...
berglunddj
Dec 16, 2002 2:19 pm
Hi, Here's a counter example. John...
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Jon Perry
jon_perryuk
Dec 16, 2002 6:12 pm
Thanks. The simplest counter-example found is attached. Jon Perry perry@... http://www.users.globalnet.co.uk/~perry/maths/ ...
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Paul Erlich <paul@...
emotionaljou...
Dec 19, 2002 12:11 am
... 60 ... well, i cheated and just made all the vertices equidistant from the center. looks basically like the real thing. here's the result: ...
83
polychoron <polych...
polychoron
Dec 19, 2002 3:00 am
hello Polytopians, I have been uploading various images that i have been collecting over the last year or so to the Files section of Polytopia. There are...
84
Paul Erlich <paul@...
emotionaljou...
Dec 19, 2002 9:57 pm
hi dan . . . hope you liked my make-your-own pentakis-dodecahedron-globe project. if you're interested in how higher-dimensional geometry relates to other...
85
Jon Perry
jon_perryuk
Dec 26, 2002 7:34 pm
A paper on, at: http://www.users.globalnet.co.uk/~perry/maths/chessgraph/chessgraph.htm Jon Perry perry@... ...
86
Robert Angus <angi...
angilluminati
Dec 31, 2002 9:45 am
Thank you all for the wonderful information you have provided me with thus far. I would also like to add that any magickians involved herein please consider...
87
phi16 <allenlubow@...
phi16
Jan 20, 2003 10:54 pm
Can anyone recommend such software. I would like to be able to work with a three-dimensional x,y,z coordinate system using a computer program on a Macintosh to...
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Paul Erlich <paul@...
emotionaljou...
Jan 23, 2003 12:28 am
... some of the best programs for these sorts of things are mathematica and matlab. these may be out of your budgetary range, but both have tons of great...
89
allenlubow@...
phi16
Jan 23, 2003 1:56 pm
Mathematica is a bit pricey but I wouldn't mind if it would allow me to do what I want. How difficult is the learning curve?...
90
Jon Perry
jon_perryuk
Jan 23, 2003 3:49 pm
'Mathematica is a bit pricey but I wouldn't mind if it would allow me to do what I want. How difficult is the learning curve?' Have a look at: ...
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Jon Perry
jon_perryuk
Feb 5, 2003 9:01 pm
Comments appreciated; http://www.users.globalnet.co.uk/~perry/maths/integraldrawing/integraldrawin g.htm Jon Perry perry@... ...
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Jon Perry
jon_perryuk
Feb 5, 2003 9:51 pm
'are you sure the conjecture doesn't require that all edges be straight lines?' They are all straight lines, but I think you are right in essence - the ...
