Geodesic
BIFLATNESS AND BIPROJECTIVITY OF BANACH ALGEBRAS GRADED OVER A SEMILATTICE
Glasgow mathematical journal, Tome 52 (2010) no. 3, pp. 479-495

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DOI

We give sufficient conditions and necessary conditions for a Banach algebra, which is l1-graded over a semi-lattice, to be biflat or biprojective. As an application we characterise biflat and biprojective discrete convolution algebras for commutative semi-groups. 
GRØNBÆK, NIELS; HABIBIAN, FEREIDOUN. BIFLATNESS AND BIPROJECTIVITY OF BANACH ALGEBRAS GRADED OVER A SEMILATTICE. Glasgow mathematical journal, Tome 52 (2010) no. 3, pp. 479-495. doi: 10.1017/S0017089510000364
@article{10_1017_S0017089510000364,
     author = {GR{\O}NB{\AE}K, NIELS and HABIBIAN, FEREIDOUN},
     title = {BIFLATNESS {AND} {BIPROJECTIVITY} {OF} {BANACH} {ALGEBRAS} {GRADED} {OVER} {A} {SEMILATTICE}},
     journal = {Glasgow mathematical journal},
     pages = {479--495},
     year = {2010},
     volume = {52},
     number = {3},
     doi = {10.1017/S0017089510000364},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089510000364/}
}
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