H. Lewy, “An Example of a Smooth Linear Partial Differential Operator without Solution,” Annals of Mathematics, Vol. 66, No. 2, 1957, pp. 155-158. doi:10.2307/1970121

has been cited by the following article:

• TITLE: On Some Properties of the Heisenberg Laplacian

  AUTHORS: M. E. Egwe

  KEYWORDS: Heisenberg Group; Heisenberg Laplacian; Factorization; Universal Enveloping Algebra; Solvability

  JOURNAL NAME: Advances in Pure Mathematics, Vol.2 No.5, September 26, 2012

  ABSTRACT: Let IHn be the (2n+1) -dimensional Heisenberg group and let Lα and be the sublaplacian and central element of the Lie algebra of IHn respectively. Forα=0 denote by L0=L the Heisenberg Laplacian and let K ∈Aut(IHn) be a compact subgroup of Au-tomorphism of IHn. In this paper, we give some properties of the Heisenberg Laplacian and prove that L and T generate the K-invariant universal enveloping algebra, U(hn)k of IHn.