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Publication:3756729
zbMath0621.41014MaRDI QIDQ3756729
Publication date: 1980
Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Groups and semigroups of linear operators (47D03) Abstract approximation theory (approximation in normed linear spaces and other abstract spaces) (41A65) Approximation by positive operators (41A36)
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