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Bounded approximate units and bounded approximate identities. (English) Zbl 0272.46028

##### MSC:
 46H05 General theory of topological algebras 46H25 Normed modules and Banach modules, topological modules (if not placed in 13-XX or 16-XX) 43A20 $$L^1$$-algebras on groups, semigroups, etc.
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##### References:
 [1] Hans Reiter, \?\textonesuperior -algebras and Segal algebras, Lecture Notes in Mathematics, Vol. 231, Springer-Verlag, Berlin-New York, 1971. [2] Hwai Chiuan Wang, Nonfactorization in group algebras, Studia Math. 42 (1972), 231 – 241. · Zbl 0273.43008
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