Talk:Great dodecahedron

topology

How can this be a spherical tiling as it has chi = -6 when the sphere has chi = 2? Double sharp (talk) 06:41, 14 August 2009 (UTC)

See: Kepler-Poinsot_polyhedra#Euler_characteristic_.CF.87 Tom Ruen (talk) 07:17, 14 August 2009 (UTC)

net

The net figure is wrong. It shows 63 triangles, while the right net should show only 60, like this one: http://www.geometrycode.com/sgds/images/sgds_p216.gif —Preceding unsigned comment added by 85.58.36.170 (talk) 12:03, 2 July 2010 (UTC)

I changed the net to another one made by Stella. Double sharp (talk) 22:42, 18 March 2015 (UTC)

File:First stellation of dodecahedron.png Nominated for Deletion

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File:Second stellation of dodecahedron.png Nominated for Deletion

An image used in this article, File:Second stellation of dodecahedron.png, has been nominated for deletion at Wikimedia Commons in the following category: Deletion requests September 2011 What should I do? Don't panic; a discussion will now take place over on Commons about whether to remove the file. This gives you an opportunity to contest the deletion, although please review Commons guidelines before doing so. If the image is non-free then you may need to upload it to Wikipedia (Commons does not allow fair use) If the image isn't freely licensed and there is no fair use rationale then it cannot be uploaded or used. This notification is provided by a Bot --CommonsNotificationBot (talk) 10:34, 3 September 2011 (UTC)

File:Third stellation of dodecahedron.png Nominated for Deletion

An image used in this article, File:Third stellation of dodecahedron.png, has been nominated for deletion at Wikimedia Commons in the following category: Deletion requests September 2011 What should I do? Don't panic; a discussion will now take place over on Commons about whether to remove the file. This gives you an opportunity to contest the deletion, although please review Commons guidelines before doing so. If the image is non-free then you may need to upload it to Wikipedia (Commons does not allow fair use) If the image isn't freely licensed and there is no fair use rationale then it cannot be uploaded or used. This notification is provided by a Bot --CommonsNotificationBot (talk) 10:56, 3 September 2011 (UTC)

And how do we find the said discussion on Commons? —Tamfang (talk) 02:14, 4 October 2011 (UTC)

Nothing seems to be linked now!? SockPuppetForTomruen (talk) 02:20, 4 October 2011 (UTC)

Perhaps there was a notice on the Commons image page, removed when the deletion debate was closed? (Somehow I failed to note that the above notices are a month old.) —Tamfang (talk) 02:24, 4 October 2011 (UTC)

Truncated small stellated dodecahedron

The truncated small stellated dodecahedron is stated to be a dodecahedron with 12 extra faces 'under the surface'. To me this is not very convincing, it seems to me that both are the same. Remark: it can be seen that both link to the same article. Bob.v.R (talk) 17:02, 31 August 2013 (UTC)

Not only is it badly phrased, it is also wrong. The figure has 36 faces, two contributed by the original star pentagon and one by the truncated vertex. I'm not even sure where this would have been described and named. I'll fix it, drop a citation tag on it and see if anybody bites. — Cheers, Steelpillow (Talk) 17:48, 31 August 2013 (UTC) [Update] No, thinking about it, this is the wrong place to describe it anyway. I'll just delete it. — Cheers, Steelpillow (Talk) 17:52, 31 August 2013 (UTC)

I agree completely! Regards, Bob.v.R (talk) 18:15, 31 August 2013 (UTC)

Conway-style notation for star polyhedra

well, small stellated dodecahedron=S, great stellated dodecahedron=G great dodecahedron=DD, Great icosahedron=II

• 
  tS
• 
  aS
• 
  tDD
• 
  eS
• 
  bS
• 
  sD

— Preceding unsigned comment added by 99.185.3.0 (talk) 17:27, 23 December 2013 (UTC)

This is actually not quite right: taking {5/2,5} as S and {5,5/2} as E, they should be t'S (new operator t' defined as quasitruncation; the standard ones don't work); aS = aE; tE; eS = eE; b'S = b'E (new operator b' defined as quasicantitruncation); and sS = sE. Double sharp (talk) 12:33, 2 March 2015 (UTC)

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Category:Toroidal polyhedra

Why great dodecahedron is in categeory 'Toroidal polyhedra'? Its Euler characteristic is equal to -6.

Yes, so it is topologically a four-holed torus. Double sharp (talk) 14:26, 27 October 2018 (UTC)

Hypnohedron?

This Spanish blog portraying mathematical absurdities shows what appears to be an animation of a puzzle resembling either a great dodecahedron (most likely an Alexander's Star) or a triakis icosahedron:

http://casarandom.blogspot.com/2012/01/comunicado-los-lectores-que-tienden-0.html?m=1

The animation's GIF file itself is called hypnoedron, but I think it should have been called hypnohedron instead. ​‑‑🌀⁠SilSinn^AL982100⁠💬 02:19, 4 February 2019 (UTC)

In Spanish, the suffix -hedron is translated as -edro, which may explain the misspelling. – OfficialURL (talk) 17:29, 17 February 2020 (UTC)

Does anybody know Mandarin?

The corresponding article in the Chinese wiki is marked as a good article, and clearly has many more relevant diagrams than this one. I know next to no Chinese, but I still think this article could benefit from the other one, if anybody cares to translate it. – OfficialURL (talk) 17:28, 17 February 2020 (UTC)