This book serves as a reference on links and on the invariants derived via algebraic topology from covering spaces of link exteriors. It emphasizes the features of the multicomponent case not normally considered by knot-theorists, such as longitudes, the homological complexity of many-variable Laurent polynomial rings, the fact that links are not usually boundary links, free coverings of homology boundary links, the lower central series as a source of invariants, nilpotent completion and algebraic closure of the link group, and disc links. Invariants of the types considered here play an essential role in many applications of knot theory to other areas of topology.This second edition introduces two new chapters - twisted polynomial invariants and singularities of plane curves. Each replaces brief sketches in the first edition. Chapter 2 has been reorganized, and new material has been added to four other chapters.

In the spirit of Julian Is a Mermaid, this irrepressible picture book celebrates drag kids, individuality, and self-confidence from the perspective of a fabulous wig! When a child dresses in drag to compete in a neighborhood costume competition, he becomes B. B. Bedazzle! A key part of B.B. Bedazzle's ensemble is a wig called Wig. Together they are an unstoppable drag queen team! But Wig feels inadequate compared to the other, bigger wigs. When Wig flies off B. B.'s head, she goes from kid to kid instilling confidence and inspiring dreams in those who wear her: Wig remembers what wigs can do. Wig brushes the world, bolder, brighter hues. Wig hears whispered wishes... and turns them into something true. The bigger their dreams, the bigger Wig seems. This wonderful read aloud celebrates the universal childhood experience of dressing up and the confidence that comes with putting on a costume. And it goes further than that, acknowledging that sometimes dressing differently from what might be expected is how we become our truest and best selves.

Oge Mora's Saturday meets Carmela Full of Wishes in this touching and whimsical picture book about a mother and child's last trip to their local laundromat before moving away. Every Sunday after cereal, Sam and Mom walk to the laundromat, wash their clothes, and see their friends. But this Sunday is different. Today, doing laundry means packing clean clothes in boxes to move away. Sam doesn't want to leave their neighborhood and friends. Maybe if they hope with all their might, they can turn a washing machine into a wishing machine! Sam's imagination transforms the mundane into a series of wonders as they cope with change and learn the true meaning of home.

To attack certain problems in 4-dimensional knot theory the author draws on a variety of techniques, focusing on knots in S^T4, whose fundamental groups contain abelian normal subgroups. Their class contains the most geometrically appealing and best understood examples. Moreover, it is possible to apply work in algebraic methods to these problems. Work in four-dimensional topology is applied in later chapters to the problem of classifying 2-knots.