# Basic noncommutative geometry by Masoud Khalkhali

By Masoud Khalkhali

"Basic Noncommutative Geometry presents an advent to noncommutative geometry and a few of its purposes. The publication can be utilized both as a textbook for a graduate path at the topic or for self-study. will probably be helpful for graduate scholars and researchers in arithmetic and theoretical physics and all people who are attracted to gaining an realizing of the topic. One function of this ebook is the Read more...

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Additional info for Basic noncommutative geometry

Example text

Kac in the 1960s in the context of Kac–von Neumann Hopf algebras, has now found its complete generalization in the notion of bicrossed product of matched pairs of Hopf algebras due to Shahn Majid. See [128] for extensive discussions and references. 7 From groups to Hopf algebras and quantum groups 39 construction, of which the most relevant for the structure of the Connes–Moscovici Hopf algebra is the following. H / of a finite dimensional Hopf algebra [128], [105]. Let U and F be two Hopf algebras.

18) Without loss of generality we can assume that I is an ideal in F Œx1 ; : : : ; xn . A morphism between affine varieties V F n and W F m is a map f W V ! W which n m is the restriction of a polynomial map F ! F . It is clear that affine varieties and morphisms between them form a category. 17). , if x n D 0 for some n, then x D 0. Consider the category of unital finitely generated commutative and reduced algebras and unital algebra homomorphisms. 17). x/ D 0 for all x 2 V g: Obviously OŒV  is a finitely generated commutative unital reduced algebra.

The answer is yes and by relaxing the commutativity assumption on the resulting structure we obtain an object which in many ways behaves like a group but is not a group. It is called a Hopf algebra. Quantum groups are closely related objects. 1 iv) for more on this). We start with a simple example. G/ denote the commutative algebra of complex-valued functions on G. Notice that the algebra structure on H has nothing to do with the group structure on G. The group structure on G is usually defined via the multiplication, inversion and unit maps pW G G !