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Open Access Research Article Issue
f-Statistical convergence on topological modules
Electronic Research Archive 2022, 30(6): 2183-2195
Published: 15 June 2022
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The classical notion of statistical convergence has recently been transported to the scope of real normed spaces by means of the f-statistical convergence for f a modulus function. Here, we go several steps further and extend the f-statistical convergence to the scope of uniform spaces, obtaining particular cases of f-statistical convergence on pseudometric spaces and topological modules.

Open Access Research Article Issue
On absolutely invertibles
Electronic Research Archive 2024, 32(12): 6578-6592
Published: 15 December 2024
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In this manuscript, the notion of absolutely invertible was extended consistently from semi-normed rings to the class of general topological rings. Then, the closure of the absolutely invertibles multiplied by a certain element was proved to be contained in the set of topological divisors of the element. Also, a sufficient condition for the closed unit ball of a complete unital normed ring to become a closed unit neighborhood of zero was found. Finally, two applications to classical operator theory were provided, i.e., every Banach space of dimension of at least 2 could be equivalently re-normed in such a way that the group of surjective linear isometries was not a normal subgroup of the group of isomorphisms, and every infinite-dimensional Banach space, containing a proper complemented subspace isomorphic to it, could be equivalently re-normed so that the set of surjective linear operators was not dense in the Banach algebra of bounded linear operators.

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