Abstract
We prove that the forgetful functors from the categories of C⁎- and W⁎-algebras to Banach ⁎-algebras, Banach algebras or Banach spaces are all monadic, answering a question of J.Rosický, and that the categories of unital (commutative) C⁎-algebras are not locally-isometry ℵ0-generated either as plain or as metric-enriched categories, answering a question of I. Di Liberti and Rosický.
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