L-estimates for the wave equation on the Heisenberg group.
Detlef Müller, Elias M. Stein (1999)
Revista Matemática Iberoamericana
Similarity:
Let £ denote the sub-Laplacian on the Heisenberg group H. We prove that e / (1 - £) extends to a bounded operator on L(H), for 1 ≤ p ≤ ∞, when α > (d - 1) |1/p - 1/2|.