عنوان	Johnson pseudo-contractibility certain semigroup algebras II
نوع پژوهش	مقاله چاپ‌شده در مجلات علمی
کلیدواژه‌ها	Semigroups, Semi-lattices, Clifford semigroups, Amenability, Johnson pseudo-contractibility, Pseudo-contractibility.
چکیده	In this paper, we investigate Johnson pseudo-contractibility and pseudo-contractibility of Clifford semigroup algebras. We shall show that, for a Clifford semigroup $ S $ if $ \ell^{1}(S) $ has a central approximate identity in $ c_{00}(S) $, then $ \ell^{1}(S) $ is (Johnson) pseudo-contractible if and only if $ E(S) $ is locally finite and each maximal subgroup of $ S $ is (amenable) finite, respectively. As an application we characterize Johnson pseudo-contractibility and pseudo-contractibility of $ \ell^{1}(S) $, where $S$ are a commutative semigroup, a band semigroup and an inverse semigroup with totally ordered idempotents set.
پژوهشگران	مهدی عسکری سیاح (نفر اول)، عبدالرسول پورعباس (نفر دوم)، امیر سهامی (نفر سوم)