activity
19952026
most cited3-dimensional Cauchy-Riemann structures and 2nd order ordinary differential equations

81 citations · 175 across the 30 of their papers we have counts for

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Showing 2001Show all

2 papers · 1 filter

math.DG2001★ 17 cited

Conformally invariant powers of the ambient Dirac operator

Jonathan Holland, George Sparling

This paper constructs a family of conformally invariant differential operators acting on spinor densities with leading part a power of the Dirac operator. The construction applies…

math-ph2001

Null electromagnetic fields and relative CR embeddings

Jonathan Earl Holland, George Sparling

This paper applies the notion of relative CR embeddings to study two related questions. First, it answers negatively the question posed by Penrose whether every shear-free null rot…