Abstract

We proceed with the necessary modifications in the formulation of the second lines of (2.8), (2.9) and (2.11), (2.12) of Theorem 2.1 and Corollary 2.2, respectively, included in the original article. The second lines of (2.8) and (2.9) of Theorem 2.1 of the original article should be replaced by (1.2) and (1.4) below, respectively. For the reader’s convenience, we proceed with one proof of the later assertion.

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