
Journal of Lie Theory 12 (2002), No. 2, 423447 Copyright Heldermann Verlag 2002 Complete Filtered Lie Algebras over a Vector Space of Dimension Two Thomas W. Judson Dept. of Mathematics and Computer Science, University of Puget Sound, 1500 North Warner Street, Tacoma, WA 98416, U.S.A. There may exist many nonisomorphic complete filtered Lie algebras with the same graded algebra. In our previous paper "Complete filtered Lie algebras and the Spencer cohomology", J. Algebra 125 (1989) 66109, we found elements in the Spencer cohomology that determined all complete filtered Lie algebras having certain graded algebra provided that obstructions do not exist in the cohomology at higher levels. In this paper we use the Spencer cohomology to classify all graded and filtered algebras over a real vector space of dimension two. [ Fulltextpdf (223 KB)] 