内容简介:For additional information, seeloki3.com.
Explorable Flexagons
Learn to create and flex flexagons
By:Scott Sherman
Chapter 1: Flexagon Intro
Exploring the hidden sides of hexaflexagons
- Introduces the hexaflexagon , with6equilateral triangles per side, and the pinch flex , a way of folding a flexagon to reveal previously hidden sides
- Let’s you explore how to visit every side of a flexagon
- Describes flex notation , which can be used to precisely describe a sequence of flexes
- Introduces the Tuckerman Traverse as a technique for visiting every side of a flexagon using the pinch flex
- Provides both a flexagon simulation and the unfolded strip for all hexaflexagons with3,4,5,6,7, and8sides so you can make your own
- Shows flexagons made up of different shapes of triangles, like using angles of30-60-90or54-54-72, and different numbers of triangles per side, like4,8,10, or12
Chapter 2: Flexing Flexagons
A short tour of different ways to flex a flexagon
- Describes a naming convention for a wide variety of triangle flexagons, like pentaflexagon and silver octaflexagon
- Defines a minimal flexagon as the simplest flexagon that supports a given flex
- Demonstrates a sampling of interesting flexes on triangle flexagons: the pyramid shuffle, flip flex, tuck flex, v-flex, and silver tetra flex
- Shows that once you generalize the types of flexes you use, the concept of “sides” of a flexagon is no longer sufficient for understanding all the states you can explore
Chapter 3: Generating Sequences
Creating flexagons with flex sequences
- Summarizes the flex notation that was previously introduced for describing sequences of flexes
- Defines a generating sequence as a sequence of flexes used to create the structure necessary for performing them on a given flexagon
- Shows how different flexes move you around a pinch flex diagram
- Gives you an interactive tool for typing in generating sequences to see what pinch flex diagram is generated
- Allows you to type in generating sequences consisting of any of the flexes introduced so far on a wide variety of triangle flexagons, giving you the unfolded strip that can be used to construct a working flexagon
Chapter 4: Pinch Flex Variations
Relatives of the pinch flex on different flexagons
- Describes a class of flexes that are related to the standard pinch flex
- Shows the minimal flexagon for a variety of flexes (e.g. P334and P3333) on several flexagons (e.g. the enneaflexagon and decaflexagon)
- Demonstrates generating sequences using these flexes to create interesting flexagons
Chapter 5: Slot Flexes
Flexes that involve sliding leaves through slots
- Describes a class of flexes called slot flexes
- Demonstrates the related flexes called the slot half and slot pocket
- Shows four slot tuck flex variants
- Finishes with the slot triple pocket flex on a pentaflexagon
[[[1,2],3], 4, 5, [6,7], 8, 9]
post :
[2, 4, 5, [6,7], 8, [-1,[9,-3]]]
Chapter 6: New flexes
How to define flexes with pat notation
- Describes using pat notation for the internal structure of a flexagon
- Shows how to define what a flex does by using pat notation to enumerate a flexagon’s structure before and after a flex
- Demonstrates using a flex definition to predict where you can do a flex and to predict exactly how a flexagon will change if you do the flex
- Provides definitions of the flexes discussed so far for hexaflexagons
- Lists additional details you need to fully understand when a flex can be performed
- Walks through an example of how to define a new flex and how to add it to the flexagon simulator
-
I ~= (Sh>>T'>^T<<^) 2
-
I ~= (Ltb>P>P>) 12
-
P ~= T>>>V>>>
soT' ~= >>>V>>>^P^
Chapter 7: Flex Sequences
Cycles, traversals, primes, and equalities
- Tools for finding cycles, flex sequences that end where they begin
- Examples of traversals, cycles that visit every state of a flexagon
- Prime flexes that can’t be replaced by other flexes
- Sequences of flexes that are equal or almost equal to each other
Appendix: Flexagon Playground
General tools for exploring flexagons
- Tools for creating new flexagons from generating sequences or scripts and exploring them using a variety of flexes
- Get the unfolded strip for any of your creations so you can try out the physical version
- An explorer that can find all the states accessible with a specified set of flexes from any flexagon
Appendix: Flex Compendium
Details about flexes on triangle flexagons
- Reference guide to a wide variety of flexes on triangle flexagons
- Shows sample slides and sample strips to fold on various triangle flexagons
- Shows flex definitions in pat notation, etc.
Flexagon References
Sources for additional flexagon information
- Bibliography for papers and publications
- Additional references
For additional information, seeloki3.com.
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