Can anyone think of a conjecture that involed graphs that use a curved line. e.g. 1,2,3,4 is a square, 12,23,34,14 are edges, as are 24 and 13. As the graph is...
49
Paul Erlich
emotionaljou...
Sep 11, 2002 10:31 pm
... you're supposed to consider all the possible ways of connecting the points in the happy end problem. ... huh?...
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Jon Perry
jon_perryuk
Sep 12, 2002 5:10 pm
... That means we can always create triangles, but no whole quads. A whole quad is a quadrilateral with no edges inside it. Jon Perry perry@... ...
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asathaxx@...
keith_carlock
Sep 12, 2002 6:37 pm
First here is my standard summary:"I invented invisibility and holodeck technology,both are one and the same things.Both require 3-Dimensional ...
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asathaxx@...
keith_carlock
Sep 12, 2002 6:50 pm
These are pics of my Lenticular Box.It is not actually Lenticular,but it is my modification of Victorian picture puzzle art that preceeded today's Lenticular...
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asathaxx@...
keith_carlock
Sep 12, 2002 6:59 pm
The top picture is of my mini-Lenticular Cube with 4 newly added view angles per side,giving 8 new views from each corner where 3 sides meet to create a ...
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Jon Perry
jon_perryuk
Sep 12, 2002 7:35 pm
The old one was flawed, but this one is better - 22 points: http://www.users.globalnet.co.uk/~perry/maths/barnette/barnette.htm Jon Perry perry@......
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Paul Erlich
emotionaljou...
Sep 12, 2002 10:02 pm
... the ... you're also free to *not* connect any given pair of points....
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polychoron
Sep 13, 2002 3:50 am
This is a great tool for making models of polyhedra. http://home.connexus.net.au/~robandfi/Stella.html...
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Jon Perry
jon_perryuk
Sep 13, 2002 5:11 pm
Thanks. I understood it eventually. So what's the problem with it? Is the general idea that g(n)=2^(n-2)+1? Jon Perry perry@... ...
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Paul Erlich
emotionaljou...
Sep 13, 2002 8:30 pm
... +1? if you look again at the website, you'll see that it's not quite so simple . . . unless of course you've somehow outwitted all the mathematicians who...
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berglunddj@...
berglunddj
Sep 13, 2002 11:20 pm
Hi, Your design sounds plausible, if you have a way to ensure that the angle of the light incident on the outer sphere is identical with the angle of the light...
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berglunddj@...
berglunddj
Sep 13, 2002 11:21 pm
Hi, all. Oops. I sent my reply to all instead of just the originator. Sorry. John...
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Keith Jason Carlock D...
keith_carlock
Sep 14, 2002 10:37 pm
Check it out,then join my group at http://groups.yahoo.com/group/iinventedinvisibility...
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Jon Perry
jon_perryuk
Sep 22, 2002 5:22 pm
A couple of smaller counter-examples (hopefully): http://www.users.globalnet.co.uk/~perry/maths/barnette/barnette.htm See:My latest 'counter-examples' - but do...
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Jon Perry
jon_perryuk
Nov 10, 2002 6:56 pm
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 ...
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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 ...
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Paul Erlich
emotionaljou...
Nov 27, 2002 7:56 pm
... matter ... problem ... i don't understand the question. can you elaborate please?...
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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...
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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@... ...
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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...
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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...
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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...
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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....
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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...
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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...
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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...
