“…The proof of [1, Lemma 2.1] is based on work in [3] that has been discovered to contain an error; see [4]. This lemma holds under an additional hypothesis, but not in general; cf.…”
“…The proof of [1, Lemma 2.1] is based on work in [3] that has been discovered to contain an error; see [4]. This lemma holds under an additional hypothesis, but not in general; cf.…”
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