By R. H. Bing

ISBN-10: 0821810405

ISBN-13: 9780821810408

This ebook belongs in either graduate and undergraduate libraries as an invaluable reference for college kids and researchers in topology. it's directed towards mathematicians attracted to geometry who've had a minimum of a starting direction in topology. it's going to give you the reader with a greater figuring out of the actual houses of Euclidean 3-space--the house within which we presume we are living. The reader should still examine of a few unsolved difficulties that proceed to baffle reseachers. the main profound lead to the quantity is the aspect approximation theorem. notwithstanding, the various initial effects and a few of the purposes can be used extra often for reference.

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2 €. This formula is familiar in form, if not in meaning. It looks just like the formula expressing the co-associativity of the co-multiplication in a Hopf algebra (or even in a co-algebra). Coincidences like this are not "accidents" in mathematics. What is happening here is that every Hopf algebra is a left co-module over itself with the co-action being the co-multiplication. One more word of caution: Each of the double indices in ! 10/ and ! 3). 2). It is ! D ".! 0/ /! 4) for all ! 2 €. Again, this is reminiscent of a formula for Hopf algebras.

We will see later how this concept comes back to the commutative setting of finite groups in Chapter 13 to give us a new way of introducing infinitesimal structures there. 2, we have seen for the first time a q-deformation. These give many, though by no means all, examples of objects in noncommutative geometry. We will comment more on q-deformations in the notes at the end of Chapter 12. 1 Definitions We now assume that A is a Hopf algebra. The co-multiplication in A is denoted by W A ! A ˝ A; and the co-inverse (also known as the antipode) is denoted by Ä W A !

A for which we have the following two commutative diagrams: €ˆ ! € ? A ? 7) € ˆ˝id ! € ˝A˝A and €ˆ € ? A ? 8) Š € ! € ˝ C: One also says that a vector space € together with a given right co-action ˆ€ is a right A-co-module. 1. 8). 2. As with almost all definitions, there are trivial examples. v/ WD 1 ˝ v for all v 2 €. Prove that T€ is indeed a left co-action. Then define the trivial right co-action of A on €. There is some other terminology that is used for left and right co-actions, and this has been known to lead to a lot of avoidable confusion.

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The geometric topology of 3-manifolds by R. H. Bing


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