Interactive Euclid's Elements

Few books in history have affected the development of mathematical, scientific, and philosophical thought more than Euclid's Elements.

The propositions and figures in the first 4 books form the geometric core of the work. We have turned the 127 original black and white static figures into colorful, interactive apps that illustrate the propositions dynamically.

What translator Sir Thomas Heath calls "one of the noblest monuments of antiquity" is newly dressed for the 21st century.

24 Whimsical Clocks: and the mathematics behind them

Each chapter in this eBook begins with a weird clock, and discusses the mathematics that turns up in its wake. Most, but not all, of the clocks describe curves, so much, but not all, of the mathematics involves the geometry of curves.

Striking interactive visual proofs of intriguing results will whet your appetite to explore this mathematics yourself.

This book will delight anybody with an interest in mathematics, regardless of how much or how little formal education they have in the subject.

Common Core Nuggets

Teachers are searching through an overwhelming mountain of information labeled "Common Core" to find materials and activities that will be helpful in implementing the standards with their students.

This group of apps consists of simple, short, and focused interactive demonstrations and explorations that are designed to help students master the important concepts of a single standard.

Available in iOS, Android, TI-NSpireTM, and Web editions.