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
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.
'One of the most interesting and original thinkers about the rise of China' - Peter FrankopanIts vast infrastructure projects now extend from the ocean floor to outer space, and from Africa's megacities into rural America. China is wiring the world, and, in doing so, rewriting the global order. As things stand, the rest of the world still has a choice.But the battle for tomorrow will require America and its allies to take daring risks in uncertain political terrain. Unchecked, China will reshape global flows of data to reflect its own interests - and the lives of countless individuals enmeshed in its systems. Taking readers on a global tour of these emerging battlefields, Jonathan E.Hillman reveals what China's digital footprint looks like on the ground, and explores the dangers of a world in which all routers lead to Beijing.
