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Abstract. In this paper we give some approximated solutions for an operator equation where is a bounded bijection and a self-adjoint operator on a separable Hilbert space H . We use canonical dual frames in order to precondition the linear equation so that convergence of iterative methods is...
Abstract. In the present work the closedness of an operator and the existence of a resolvent for a class of mixed type operators with increasing coefficients in an unbounded domain are proved.
Abstract. Applying the weak s -semipermutability of some primary subgroup, we investigate the structure of finite groups. Some recent known results are generalized and unified.
Abstract. Let V be a set of cardinality v (possibly infinite). Two graphs G and with vertex set V are isomorphic up to complementation if is isomorphic to G or to the complement of G . Let k be a non-negative integer. The graphs G and are k -hypomorphic up to complementation if for every k...
Abstract. In this article, a posteriori error analysis of a finite volume method based on the nonconforming rotated Q 1 element for the two-dimensional Stokes equations is investigated. An explicit residual-based computable error indicators are presented and analyzed in H 1 - and L 2 -norm...
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