Zebra Stripe Card
Recreational Math
Zebra stripe IBM binary card.
G4G14
John E. Miller
G14-015
Winning Ways HexaFlexagon
Puzzle
Art
Toy
Sadly, all within 13 months of each other, the three authors of the iconic book Winning Ways for Your Mathematical Plays passed away.
Elwyn Berlekamp: Sept 6 1940 – Apr 9 2019
Richard Guy – Sept 30 1916 – Mar 9 2020
John Horton Conway: Dec 26 1937 – Apr 11 2020
All three were friends with Martin and were regulars at the Gathering. Their legacies are grand, and their presence will all be missed.
G4G14
Sean Graves
G14-058
Wild Dice and Explicit Bounds
Recreational Mathematics
Joe Buhler
G4G14 Gift Exchange Book
G14-P019
What is Ethnomathematics, and How Can It Help Solve a Math Problem?
Recreational Mathematics
Tracy Drinkwater
G4G14 Gift Exchange Book
G14-P020
Waving Goodbye
Art
T. Arthur Terlep
G4G14 Gift Exchange Book
G14-P009
Warped-Grid Jig-saw Puzzles
Puzzles
George Hart
G4G14 Gift Exchange Book
G14-P050
Warped-Grid Jig-Saw Puzzle
Puzzle
With a laser-cutter, it is easy to make one-of-a-kind jigsaw puzzles. The question then is what pattern of cuts to use. Here is a gallery of some experiments I have been making in which the cut pattern is based on a warped grid. A pseudorandom grid-based dissection of an underlying rectangular array is distorted to give engaging visual effects.
G4G14
George Hart
G14-028
Walk a Crooked Path
Puzzles
Jaap Scherphuis
G4G14 Gift Exchange Book
G14-P058
Walk a Crooked Path
Puzzle
Game
In this puzzle you must find the most crooked path on a board made of squares. Each square is visited at most once, but you need not visit all squares. Your path goes from square to adjacent square, and should have as many 90-degree turns as possible.
G4G14
Jaap Scherphuis
G14-047
Veternary - Magic Trick
Game
Art
Mathematical Magic
Recreational Math
An animal based who-is-who in which with the right three questions any animal becomes uniquely identified using a ternary "sieve". For the first 16 animals this also works in binary.
Tiago Hirth
G4G14
Ines Amaro
Illistrations & Design: Ines Amaro
G14-016
Troxes
Puzzle
Like Origami meets Lego. No scissors, tape, or glue. This modular paper cutout is based on triangular geometry and mates with neighbors (edge-connecting) to create tetrahedra, octohedra, and icosahedra. The resulting polyhedra can then mate once again in their volumetric form by face-connecting with other polyhedra.
Troxes were inspired by Jef Raskin's Bloxes, a cardboard architecture exploration. Troxes in contrast are hand-held, created from a beautiful single ply paper called Plike, and promote non-rectilinear spatial exploration and awareness.
Troxes have won numerous awards at Maker Faires and been featured at the MIT Museum, New Museum and MoMath in NYC amongst other top art and design institutions.
G4G14
Jonathan Bobrow
G14-020
Traveling Through the Sierpinski Carpet and Menger Sponge
Recreational Mathematics
Derek Smith
G4G14 Gift Exchange Book
G14-P036
Traveling Through the Sierpinski Carpet and Menger Sponge
Puzzle
Recreational Math
An ant wants to travel from one corner of the Sierpinski carpet to the opposite corner using the shortest possible route. And his friend, a termite, wants to do the same in the Menger sponge. Can you guide them well?
G4G14
Derek Smith
G14-052
Travel Straws
Toy
Re-usable straws in a little keychain-round container with G4G logo (from 2021 conference that was postponed) on it.
G4G14
Delicia Kamins
G14-038
Towers and Dragons: An Unexpected Connection
Recreational Mathematics
Douglas O'Roark
G4G14 Gift Exchange Book
G14-P031
Topological Dance Puzzles
Puzzles
Karl Schaffer
G4G14 Gift Exchange Book
G14-P057
Three Puzzles on a Familiar Theme
Puzzles
P. Justin Kalef
G4G14 Gift Exchange Book
G14-P054
The Sirius Enigmas Mathematical Tops
Science
Kenneth Brecher
G4G14 Gift Exchange Book
G14-P066
The Martian Mayor Problem and 4 Pictures
Puzzles
T. Arthur Terlep
G4G14 Gift Exchange Book
G14-P062
The Martian Mayor Problem
Recreational Math
The Martian Mayor Problem looks at designing square modular networks which create Euclidean distances between modules. The catch is that there are a limited number of tunnels (connections) between modules. This is a mostly open problem as far as I know.
G4G14
T. Arthur Terlep
G14-001
The Law Of The Third
Recreational Mathematics
Adam Atkinson
G4G14 Gift Exchange Book
G14-P018
The Art of Destroying Flexagons
Recreational Mathematics
Yossi Elran
G4G14 Gift Exchange Book
G14-P021
The Art of Destroying Flexagons
Puzzle
Toy
Recreational Math
Destroying flexagons can be fun and artistic! We suggest 4 different ways to artistically destroy flexagons, each with its own merit. Our exchange gift is a set of 4 flexagons strips, one for each demonstration and the attached explanation sheet.
G4G14
Yossi Elran
G14-054
The Accountant
Puzzles
Barney Sperlin
G4G14 Gift Exchange Book
G14-P060
The Accountant
Recreational Math
Legacy
Martin Gardner would sometimes wrap puzzles inside stories he concocted, such as with the book “The Numerology of Dr. Matrix.” The following puts my favorite puzzle in that tradition: The Accountant
by Barney Sperlin
G4G14
Barney Sperlin
G14-046