4 Operator AlgebraChapter 6: Fundamentals of Banach Algebras and C*-AlgebrasSection 6.1: Banach AlgebrasSection 6.2: Spectrum and Functional CalculusSection 6.3: Gelfand Representation of Abelian Banach AlgebrasSection 6.4: Spectrum and Functional Calculus in C*-AlgebrasSection 6.5: Continuity of HomomorphismsPowered by Spec