A new approximation method for solving variational inequalities and fixed points of nonexpansive mappings.
A new characteristic property of the Mittag-Leffler function with 1 < α < 2 is deduced. Motivated by this property, a new notion, named α-order cosine function, is developed. It is proved that an α-order cosine function is associated with a solution operator of an α-order abstract Cauchy problem. Consequently, an α-order abstract Cauchy problem is well-posed if and only if its coefficient operator generates a unique α-order cosine function.
Let be a separable infinite dimensional complex Hilbert space, and let denote the algebra of all bounded linear operators on into itself. Let , be -tuples of operators in ; we define the elementary operators by In this paper, we characterize the class of pairs of operators satisfying Putnam-Fuglede’s property, i.e, the class of pairs of operators such that implies for all (trace class operators). The main result is the equivalence between this property and the fact that...
In this paper a new class of self-mappings on metric spaces, which satisfy the nonexpensive type condition (3) below is introduced and investigated. The main result is that such mappings have a unique fixed point. Also, a remetrization theorem, which is converse to Banach contraction principle is given.