Yossi Elran – författare

The hexaflexagon is a folded paper strip of colored triangles that has long delighted people with how it “magically” changes its appearance when “flexed”. This hands-on, comprehensive book goes beyond the hexaflexagon, the standard version of this folded puzzle, exponentially expanding the barely explored field of flexagons as it brings new options and fresh insights to light.● Learn over a dozen different flexes, and make dozens of different flexagons with the aid of step-by-step illustrated directions and templates to copy and print.● Delve into the internal structure of flexagons and discover a universal way to describe and predict their behavior.● Learn how to create your own custom flexagons with a special computer program.● Understand how flexagons are connected to group theory, computer science, and topology.● Have fun decorating flexagons and make flexagon books, puzzles, pop-ups, mazes, and more.Written in a clear, easy-to-understand, and conversational style and enhanced with challenges and tips to broaden your flexagon skills and spark creativity, The Secret World of Flexagons: Fascinating Folded Paper Puzzles is a must for flexagon enthusiasts, teachers, students, libraries, mathematicians, and everyone who loves to solve a good puzzle.

The hexaflexagon is a folded paper strip of colored triangles that has long delighted people with how it “magically” changes its appearance when “flexed”. This hands-on, comprehensive book goes beyond the hexaflexagon, the standard version of this folded puzzle, exponentially expanding the barely explored field of flexagons as it brings new options and fresh insights to light.● Learn over a dozen different flexes, and make dozens of different flexagons with the aid of step-by-step illustrated directions and templates to copy and print.● Delve into the internal structure of flexagons and discover a universal way to describe and predict their behavior.● Learn how to create your own custom flexagons with a special computer program.● Understand how flexagons are connected to group theory, computer science, and topology.● Have fun decorating flexagons and make flexagon books, puzzles, pop-ups, mazes, and more.Written in a clear, easy-to-understand, and conversational style and enhanced with challenges and tips to broaden your flexagon skills and spark creativity, The Secret World of Flexagons: Fascinating Folded Paper Puzzles is a must for flexagon enthusiasts, teachers, students, libraries, mathematicians, and everyone who loves to solve a good puzzle.

British-Israeli recreational mathematician, communicator and educator, Yossi Elran explores in-depth six of the most ingenious math puzzles, exposing their long "tails": the stories, trivia, quirks and oddities of their history and, of course, the math and mathematicians behind them. In his unique "talmudic", associative way, Elran shows the hidden connections between Lewis Carroll's "Cats and Rats" puzzle and the math of taxi driving, a number pyramid magic trick and Hollywood movie fractals, and even how packing puzzles are related to COVID-19!Elran has a great talent for explaining difficult topics — including quantum mechanics, a topic he relates to some original "operator" puzzles — making the book very accessible for all audiences.With over 40 additional, original puzzles, and touching on dozens of hot math topics, this is a perfect book for math lovers, educators, kids and adults, and anyone who loves a great read.Yossi Elran is co-author of our bestselling The Paper Puzzle Book, and heads the Innovation Center at the Davidson Institute of Science Education, the educational arm of the world-renowned Weizmann Institute of Science in Israel.

British-Israeli recreational mathematician, communicator and educator, Yossi Elran explores in-depth six of the most ingenious math puzzles, exposing their long "tails": the stories, trivia, quirks and oddities of their history and, of course, the math and mathematicians behind them. In his unique "talmudic", associative way, Elran shows the hidden connections between Lewis Carroll's "Cats and Rats" puzzle and the math of taxi driving, a number pyramid magic trick and Hollywood movie fractals, and even how packing puzzles are related to COVID-19!Elran has a great talent for explaining difficult topics — including quantum mechanics, a topic he relates to some original "operator" puzzles — making the book very accessible for all audiences.With over 40 additional, original puzzles, and touching on dozens of hot math topics, this is a perfect book for math lovers, educators, kids and adults, and anyone who loves a great read.Yossi Elran is co-author of our bestselling The Paper Puzzle Book, and heads the Innovation Center at the Davidson Institute of Science Education, the educational arm of the world-renowned Weizmann Institute of Science in Israel.

Embark on a delightful sequel to Lewis Carroll's Cats and Rats ... and Other Puzzles with Interesting Tails with this new treasure trove of mathematical curiosities! Like its predecessor, this book is a homage to recreational mathematics, inspired by the ingenious works of Martin Gardner, Ian Stewart, Raymond Smullyan, and more contemporary minds like Jason Rosenhouse, Ben Orlin and Matt Parker.Each chapter unveils a new puzzle, setting the stage for a journey through mathematical thought. This book doesn't just rehash old puzzles; it breathes new life into them. From unravelling the complexities of Archimedes' Ostomachion to deciphering the intricacies of modern cryptography, the topics are as varied as they are fascinating. Dive into the relationship between mathematics and linguistics, see the solutions to ancient number puzzles in modern math art, and solve mazes with logic and intuition.Whether you're a seasoned mathematician, a curious historian, an eager student, or a teacher looking for captivating educational tools, this book is your gateway to enhancing creative thinking and innovation through the playful side of math. Prepare to be challenged, intrigued, and inspired as every page turns mathematics into an exhilarating adventure!

Embark on a delightful sequel to Lewis Carroll's Cats and Rats ... and Other Puzzles with Interesting Tails with this new treasure trove of mathematical curiosities! Like its predecessor, this book is a homage to recreational mathematics, inspired by the ingenious works of Martin Gardner, Ian Stewart, Raymond Smullyan, and more contemporary minds like Jason Rosenhouse, Ben Orlin and Matt Parker.Each chapter unveils a new puzzle, setting the stage for a journey through mathematical thought. This book doesn't just rehash old puzzles; it breathes new life into them. From unravelling the complexities of Archimedes' Ostomachion to deciphering the intricacies of modern cryptography, the topics are as varied as they are fascinating. Dive into the relationship between mathematics and linguistics, see the solutions to ancient number puzzles in modern math art, and solve mazes with logic and intuition.Whether you're a seasoned mathematician, a curious historian, an eager student, or a teacher looking for captivating educational tools, this book is your gateway to enhancing creative thinking and innovation through the playful side of math. Prepare to be challenged, intrigued, and inspired as every page turns mathematics into an exhilarating adventure!

"This is a marvellous book. The diversity of possible puzzles that can be given with these very limited resources, which are basically some paper and scissors, is overwhelming, and the challenges are sometimes very tough. Even the two-star problems may be hard for an untrained puzzler. This is medicine against boredom on long rainy days, but be careful not to get addicted or it may suck up your less empty and sunny days as well." See Full ReviewEuropean Mathematical Society ALL YOU NEED IS PAPER! All the puzzles inside are made out of paper — from simple teasers to extreme brain workouts!ORIGINAL DESIGNS Co-developed by a mathematician, an origami artist and a mechanical puzzle maker, this inventive book provides a unique and invaluable collection of a large, comprehensive and diverse variety of paper puzzles. And they only require a sheet of paper and perhaps a pair of scissors!EASY TO CHALLENGING There are 99 unique puzzles including paper strip puzzles, Möbius strips and flexagons, two-dimensional sheet folding, 'fold-and-cut' puzzles, 3D dissections and constructions, sequence folding puzzles, origami puzzles and even paper toys and magic. PROVIDES HOURS OF FUN Anyone of any age can find hours of enjoyment and challenge!LEARNING GEOMETRY, MATHEMATICS AND PROBLEM-SOLVING CHALLENGES CAN BE FUN! For students and teachers; parents and children; amateur and skilled mathematicians, and puzzle lovers.LEARN CONCEPTS AS YOU GO! Many of the puzzles are new and original, they complement the classic puzzles that are included and all of them come with a solution as well as a mathematical and geometrical explanation that can be easily understood by all. The layout of the book, with its extensive puzzles, solutions and detailed descriptions, make it a sure candidate as the paper puzzle 'bible' for enthusiasts and puzzle lovers everywhere.