( 1+ 2K ) - ميانگين پذيري ضعيف جبرهاي باناخ گروهي

(2k + 1)-weak amenability of group Banaeh algebras

In this paper we show that if A is (2k 4-1)-weakly amenable and A = B@I such that B is a closed subalgebra and / is a closed ideal of A , then B is (2k + 1)- weakly amenable too. We extend some results of Lau and Loy by applying above theorem. Also we show that for each dual Banach algebra A, , if A** (the second dual of A) is (2k + 1)-weakly amenable by the first Arens product, then A is (2k +1)-weakly amenable.