A tetrahedral expanded to a icosahedron

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SUMMARY

The discussion centers on the construction and understanding of a geometric object formed by expanding a tetrahedron into an icosahedron using toothpicks and glue. The creator, Alfi, has explored the concept of hexaflexagons and their relation to polyhedra, particularly referencing Arthur Stone's work and the Tuckerman traverse. Alfi seeks guidance on how to visualize and document the iterative growth of this mathematical object, specifically in creating frames that illustrate its development. The hypertetrahedron is mentioned as a key component, with its net comprising five tetrahedrons and a total of 20 triangles.

PREREQUISITES
  • Understanding of geometric shapes, specifically tetrahedrons and icosahedrons.
  • Familiarity with polyhedral structures and their properties.
  • Basic knowledge of mathematical modeling and visualization techniques.
  • Experience with constructing geometric models using physical materials like toothpicks and glue.
NEXT STEPS
  • Research the properties and applications of hypertetrahedrons in geometry.
  • Explore mathematical modeling software for visualizing polyhedral growth.
  • Learn about the construction and significance of hexaflexagons in mathematical theory.
  • Investigate the Tuckerman traverse and its implications in polyhedral studies.
USEFUL FOR

This discussion is beneficial for mathematicians, educators, and hobbyists interested in geometric constructions, polyhedral theory, and mathematical visualization techniques.

Alfi
This is really starting to bug me.

I built an object out of tooth picks and glue.
It's simple. An equilateral triangle pyramid. A four sided dice.
And then when I add a tetrahedral from each of the four faces ... it becomes an object that I just can't seem to find a description of in any of the dozens of math books I've read or on the internet.

I've been investigating this thing since I independently discovered my first hexaflexagon.
It took ten years of library search and the spread of the internet to let me know about Arthur Stone and his studies. I now have many 3,4,5,6 faced examples. And a neat example in 3d of the... Tuckerman traverse
The six sided ones led me to the models that show they are parts of icosahedron. continuing searches : http://www.princeton.edu/~mudd/findi...oral/pmc41.htm
Tukey: Arthur, yes. When did Arthur come? He must have been here by '39. Arthur, Dick Feynman, Bryant Tuckerman—who went to IBM—and I were the people who invented hexaflexagons. This came about because Arthur had an English-size notebook. Woolworth sold only American-size paper. He had to cut strips off the edges. He had to do something with the strips, so he started folding polygons. When he folded the hexagon he had the first hexaflexagon. Later came the Feynman diagram, the Tuckerman traverse, and so on.
It is an interesting object to me. I use it to create 20 sided dice with extensions that are 90 degree offset and they just lead me to see the next iteration using each face as the contact to the next icosahedron.

My problem is that I don't know any of the skills needed to make my 'simple math object' into a series of frames that show the growth of the iterations.
any help or direction that would help me to further my desire to understand and describe this object would be appreciated. Thanks : Alfi
 

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I think this is what I was looking for

http://www.mathematische-basteleien.de/hypertetrahedron.htm. If you spread out the hypertetrahedron, you get 5 tetrahedrons as its net. Together the five tetrahedrons have 5*4=20 triangles. 2*4=8 triangles are bound. If you build a hypertetrahedron, you must stick the remaining 12 triangles in pairs.
 

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