group theory

Explains how the attempts of two young nineteenth-century mathematicians--Frenchman ?variste Galois and Norwegian Niels Henrik Abel--to solve the quintic equation spawned group theory and examines the role of symmetry in nature, human perception, and human endeavor.

Presenting photographs, questions, and answers, this book introduces symmetrical objects, such as a leaf, butterfly, pinecone, and ladybug.

Photographs and simple text introduce the basic ways to sort toys.

Photographs and simple text introduce the basic ways to sort by size.

Photographs and simple text introduce the basic concepts of sorting by color.