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In this article, conjugate-linear anti-involutions and θ-unitary Harish-Chandra modules over the W-algebra W(2,2) are studied. It is proved that there are only two classes that conjugate-linear anti-involutions over W(2,2). The main result of this article is that a θ-unitary Harish-Chandra module over the W-algebra W(2,2) is simply a -unitary Harish-Chandra module over the Virasoro algebra and hence is either a simple highest or lowest weight module or a simple module from the intermediate series of the form A a,b for some [ABSTRACT FROM AUTHOR]

The baby Tits-Kantor-Koecher (TKK) algebra constructed from the smallest (nonlattice) semilattice is related to the “smallest” extended affine Lie algebras other than the finite dimensional simple Lie algebras and the affine Kac-Moody algebras. In this article, we classify the finite dimensional irreducible representations for the baby TKK algebra. It turns out that such representations can be lifted from modules of direct sums of finitely many copies of the simple Lie algebra sp4(). [ABSTRACT FROM AUTHOR]

Let Derskew(q) be the skew derivation algebra of the quantum torus [image omitted] with q ≠ 1 a pth primitive root of unity. In this article, we investigate the automorphism group of the derived Lie subalgebra of the infinite dimensional Lie algebra [image omitted]. The result of the article generalizes those obtained in Xue et al. (2006) and Zheng and Tan (2007) with q = 1 or q being generic. [ABSTRACT FROM AUTHOR]

Let W be the Virasoro-like algebra, and d1, d2 be the degree derivations of W. Set L = W⊕C d1⊕C d2. Let Fα(V) be the L-module defined by Larsson's functor applied to a finite dimensional sl2-module V. In this article, the derivations from L to L-modules Fα(V) and the first cohomology group H1(L, Fα(V)) are given. [ABSTRACT FROM AUTHOR]

In this article, we study the central extensions and derivations of the Lie algebra of skew derivations for the quantum torus. The results of the article generalize those obtained in Jiang and Meng (1998ab) and Kirkman et al. (1994). [ABSTRACT FROM AUTHOR]