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Square roots and quasi-square roots in locally multiplicatively convex algebras. (English) Zbl 0471.46029


MSC:

46H05 General theory of topological algebras
46H30 Functional calculus in topological algebras
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References:

[1] Bonsall F. F., Duncan J.: Complete Normed Algebras. Springer-Verlag 1973. · Zbl 0271.46039
[2] Ford J. W. M.: A square root lemma for Banach star algebras. J. Lond. Math. Soc. 42, p. 521-522 (1967). · Zbl 0145.38702 · doi:10.1112/jlms/s1-42.1.521
[3] Michael E. A.: Locally Multiplicatively-convex Topological Algebras. Memoirs of AMS nb 11 1952. · Zbl 0047.35502
[4] Najmark M. A.: Normirovannyje koľca. Moskva 1968.
[5] Pták V.: Banach Algebras with involution. manuscripta math. 6, p. 245–290 (1972), Springer-Verlag. · Zbl 0304.46036
[6] Pták V.: On the spectral radius in Banach algebras with involution. Bull. Lond. Math. Soc. 2, p. 327-334(1970). · Zbl 0209.44403 · doi:10.1112/blms/2.3.327
[7] Sa-do-šin: O polunormirovannych koľcach s involuciej. Izv. Ak. Nauk SSSR 23 (1959) 509-529.
[8] Wenjen, Ch.: On seminormed star algebras. Proc. J. Math. 8 (1958), p. 177-186. · Zbl 0080.32702 · doi:10.2140/pjm.1958.8.177
[9] Zelazko W.: Selected Topics in Topological Algebras. Lecture Notes Series N. 31 (1971), AArhus University. · Zbl 0221.46041
[10] Zelazko W.: Algebry Banacha. Warzsawa 1966. · Zbl 0211.43701
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