We give a full classification of 6-dimensional nilpotent Lie algebras over an arbitrary field, including fields that are not algebraically closed and fields of characteristic 2. To achieve the classification we use the action of the automorphism group on the second cohomology space, as isomorphism types of nilpotent Lie algebras correspond to orbits of subspaces under this action. In some cases, these orbits are determined using geometric invariants, such as the Gram determinant or the Arf invariant. As a byproduct, we completely determine, for a 4-dimensional vector space V , the orbits of GL(V ) on the set of 2-dimensional subspaces of V ∧ V .
The objective of this paper is to study the monoid of all partial transformations of a finite set that preserve a uniform partition. In addition to proving that this monoid is a quotient of a wreath product with respect to a congruence relation, we show that it is generated by 5 generators, we compute its order and determine a presentation on a minimal generating set.2000 Mathematics Subject Classification. 20M20, 20M10, 20M05, 05A18.
We give an algorithm for constructing a basis and a multiplication table of a finite-dimensional finitely-presented Lie ring. We apply this to construct the biggest t generator Lie rings that satisfy the n-Engel condition, for (t, n) = (t, 2), (2, 3), (3, 3), (2, 4).
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