Noncommutative Geometry

Speaker: Ali Moatadelro (Western)

"Representation theory of compact quantum groups with examples, lecture 5. Irreducible representations of SU(3), continued. "

Time: 10:00

Room: MC 107

In this series of lectures, we will discuss basic examples of compact quantum groups and their (finite dimensional) representations. We will start with reviewing the classical theory. We shall classify all finite dimensional irreducible representations of compact Lie groups SU(2) and SU(3). Then we will proceed to the general theory of representation of compact Lie groups and will discuss several important results including the highest weight theory, the Peter-Weyl decomposition theorem, and also the Borel-Weil-Bott construction of representations. Finally, we will see how much of the theory holds in the quantum case.

Noncommutative Geometry

Speaker: Ali Fathi (Western)

"Cyclic cohomology 7, (K-theory for C^*-algebras (I): fundamentals of C*-algebras and basic K-groups)"

Time: 14:30

Room: MC 107

Cyclic (co)homology is the noncommutative analogue of de Rham (co)homology and as such plays an important role in noncommutative geometry and its applications (in operator algebras, index theory, ...) A variant of it, topological Hochschild and cyclic homology, plays an important role in algebraic K-theory as well.

We will give a series of lectures on the subject (2 hours per week), starting from basic material and gradually building towards more advanced stuff. Outline: 1. Basic homological algebra in abelian categories 2. Hochschild (co)homology; computations (Hochschild-Kostant-Rosenberg, group algebras) 3. Cyclic (co)ohomology, Connes' spectral sequence; computations (relation with de Rham, group algebras); cyclic category. 4. K-theory and K-homology, 5. Connes-Chern character 6. An index formula 7. Applications to idempotent conjectures.

The basic texts to follow are: 1. Cyclic Homology, J. L. Loday 2. Noncommutative Geometry, A. Connes 3. Noncommutative Differential Geometry, Publication math. IHES, 1985, A. Connes. 4. Basic noncommutative geometry, Masoud Khalkhali

Symplectic Learning Seminar

Speaker: M. Mousavi (Western)

"Doubly Stochastic Operators"

Time: 13:00

Room: MC 105C

Doubly stochastic operators are analog of doubly stochastic matrices. We will define doubly stochastic operators by using a pre-order relation that can be defined by rearrangement of functions. We discuss different characterizations of doubly stochastic operators. If time permits we will explain a new representation for doubly stochastic operators.

Colloquium

Speaker: Roger Zierau (Oklahoma State)

"Differential operators on homogeneous spaces"

Time: 15:30

Room: MC 107

G-invariant differential operators D on a homogeneous space G/H will be discussed. A principle for constructing explicit solutions to Df=0 will be explained. This will be illustrated with several examples, such as Dirac operators.