Projective ideals of Banach algebras and approximative units
Fundamentalʹnaâ i prikladnaâ matematika, Tome 1 (1995) no. 4, pp. 1119-1123.

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It is shown that if an ideal of a commutative Banach algebra has a Schauder base, then it is projective iff it contains an approximative unit with some special properties. For uniform algebras a criterion is formulated in terms of peak sets.
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L. I. Pugach. Projective ideals of Banach algebras and approximative units. Fundamentalʹnaâ i prikladnaâ matematika, Tome 1 (1995) no. 4, pp. 1119-1123. http://geodesic.mathdoc.fr/item/FPM_1995_1_4_a23/

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