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چکیده
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In this paper, we introduce new notions of I-biflatness and I-biprojectivity, for a Banach algebra A, where I is a closed ideal of A. We show that M(G) is L1(G)- biprojective (I-biflat) if and only if G is a compact group (an amenable group), respectively. Also we show that, for a non-zero ideal I, if the Fourier algebra A(G) is I-biprojective, then G is a discrete group. Some examples are given to show the differences between these new notions and the classical ones.
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