TY - JOUR T1 - Spectral Properties of Second Order Differential Operators on Two-step Nilpotent Lie Groups JO - Journal of Partial Differential Equations VL - 1 SP - 1 EP - 10 PY - 2000 DA - 2000/02 SN - 13 DO - http://doi.org/ UR - https://global-sci.org/intro/article_detail/jpde/5491.html KW - Spectrum KW - eigenvalue KW - left invariant differential operator: nilpotent Lie group AB - In this paper, spectral properties of certain left invariant differential operators on two-step nilpotent Lie groups are completely described by using the theory of unitary irreducible representations and the Plancherel formulae on nilpotent Lie groups.