An example for Gelfand's theory of commutative Banach algebras
Let , . We construct a function which has Lipschitz Fréchet derivative on but is not a d.c. function.
We construct an example of a Fréchet m-convex algebra which is a principal ideal domain, and has the unit disk as the maximal ideal space.
We present an example of an algebra that is generated by elements, and cannot be made a topological algebra. This answers a problem posed by W. Żelazko.
We show that for every there exists a weight such that the Lorentz Gamma space is reflexive, its lower Boyd and Zippin indices are equal to zero and its upper Boyd and Zippin indices are equal to one. As a consequence, the Hardy-Littlewood maximal operator is unbounded on the constructed reflexive space and on its associate space .
We present an example of a subalgebra with infinite stable rank in the algebra of all bounded analytic functions in the unit disk.