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Let A, B is a unital Banach algebra , T: A → B is continuous protection units per homomorphism Based homomorphism T defines a T-Wely yuan and T-Fredholm yuan, when T range is B , if (1) B is a, a bilateral closed ideal , lgsr (B) ≤ 2. (2) If a ∈ Fred_T (4), ind (a) = 0, then a ∈ Fred_T ~ 0 ( a). and if T (A) is closed under the reverse , KerT no order, and lgsr (A) ≤ 2, then Fred_T ~ 0 (A) in Fred_T (A) is closed .
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