The problem (set in [2]) of characterizing the subspaces of a commutative Banach algebra enjoying the property of multiplicative extension is solved under general assumptions and examples are given. Proofs will appear in another paper.
@article{RLINA_1976_8_61_5_333_0,
author = {Sandro Levi},
title = {La propriet\`a di estensione moltiplicativa nelle algebre di Banach},
journal = {Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti},
volume = {60},
year = {1976},
pages = {333-336},
zbl = {0401.46028},
mrnumber = {0467318},
language = {it},
url = {http://dml.mathdoc.fr/item/RLINA_1976_8_61_5_333_0}
}
Levi, Sandro. La proprietà di estensione moltiplicativa nelle algebre di Banach. Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti, Tome 60 (1976) pp. 333-336. http://gdmltest.u-ga.fr/item/RLINA_1976_8_61_5_333_0/
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