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Algebra endomorphisms and derivations of some localized down-up algebras

机译:代数内态与一些局部向下代数的导数

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We study algebra endomorphisms and derivations of some localized down-up algebras AS(r + s, -rs). First, we determine all the algebra endomorphisms of A(S)(r + s, -rs) under some conditions on r and s. We show that each algebra endomorphism of A(S)(r + s, -rs) is an algebra automorphism if r(m)s(n) = 1 implies m = n = 0. When r = s(-1) = q is not a root of unity, we give a criterion for an algebra endomorphism of A(S)(r + s, -rs) to be an algebra automorphism. In either case, we are able to determine the algebra automorphism group for A(S)(r + s, -rs). We also show that each surjective algebra endomorphism of the down-up algebra A(r + s, -rs) is an algebra automorphism in either case. Second, we determine all the derivations of A(S)(r + s, (-)rs) and calculate its first degree Hochschild cohomology group.
机译:我们研究代数同构和一些局部向下代数AS(r + s,-rs)的导数。首先,我们确定在r和s的某些条件下A(S)(r + s,-rs)的所有代数同态。我们证明,如果r(m)s(n)= 1表示m = n = 0,则A(S)(r + s,-rs)的每个代数同胚是代数自同构。当r = s(-1)= q不是统一的根,我们给出了A(S)(r + s,-rs)的代数内同构为代数自同构的判据。无论哪种情况,我们都能够确定A(S)(r + s,-rs)的代数同构群。我们还显示,向下代数A(r + s,-rs)的每个射影代数内同态在两种情况下都是代数自同构。其次,我们确定A(S)(r + s,(-)rs)的所有导数,并计算其一阶Hoch​​schild同调群。

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