It is shown that no infinite-dimensional Banach space can have a weakly K-analytic Hamel basis. As consequences, (i) no infinite-dimensional weakly analytic separable Banach space E has a Hamel basis C-embedded in E(weak), and (ii) no infinite-dimensional Banach space has a weakly pseudocompact Hamel basis. Among other results, it is also shown that there exist noncomplete normed barrelled spaces with closed discrete Hamel bases of arbitrarily large cardinality.
机构:
Institute of Mathematics and Mechanics, Azerbaijan National Academy of Sciences, BakuInstitute of Mathematics and Mechanics, Azerbaijan National Academy of Sciences, Baku
Bilalov B.T.
Muradov T.R.
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机构:
Institute of Mathematics and Mechanics, Azerbaijan National Academy of Sciences, BakuInstitute of Mathematics and Mechanics, Azerbaijan National Academy of Sciences, Baku
机构:
Department of Mechanics and Mathematics, Tbilisi State University, Tbilisi 380028, Chavchavadze AveDepartment of Mechanics and Mathematics, Tbilisi State University, Tbilisi 380028, Chavchavadze Ave