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This paper constitutes a part of the author's doctoral dissertation written at the Universität Münster in 1984 under the supervision of Professor George Maltese. We take this opportunity to thank him for supporting this work and to express our sincere appreciation to Dr. Gerd Niestegge for many valuable suggestions
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Wille, R. The theorem of Gleason-Kahane-Zelazko in a commutative symmetric Banach algebra. Math Z 190, 301–304 (1985). https://doi.org/10.1007/BF01160466
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DOI: https://doi.org/10.1007/BF01160466