Ideal perturbation of elements in C*-algebras

• Main Author: Lee, Wha-Suck
• Other Authors: Stroh, Anton
• Published: University of Pretoria 2013
• Subjects: No key words available; UCTD
• Online Access: http://hdl.handle.net/2263/23751; Lee, W 2004, Ideal perturbation of elements in C*-algebras, MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/23751 >; http://upetd.up.ac.za/thesis/available/etd-01182005-113356/

The aim of this thesis is to prove the lifting property of zero divisors, n-zero divisors, nilpotent elements and a criteria for the lifting of polynomially ideal elements in C*-algebras. Chapter 1 establishes the foundation on which the machinery to prove the lifting properties stated above rests upon. Chapter 2 proves the lifting of zero divisors in C*-algebras. The generalization of this problem to lifting n-zero divisors in C*-algebras requires the advent of the corona C*-algebra, a result of the school of non-commutative topology. The actual proof reduces the general case to the case of the corona of a non-unital _-unital C*-algebra. Chapter 3 proves the lifting of the property of a nilpotent element also by a reduction to the case of the corona of a non-unital _-unital C*-algebra. The case of the corona of a non-unital _-unital C*-algebra is proved via a lifting of a triangular form in the corona. Finally in Chapter 4, a criterion is established to determine exactly when the property of a polynomially ideal element can be lifted. It is also shown that due to topological obstructions, this is not true in any C*-algebra. === Dissertation (MSc (Mathematics and Applied Mathematics))--University of Pretoria, 2004. === Mathematics and Applied Mathematics === unrestricted