71 citations · 177 across the 16 of their papers we have counts for
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math.AP2006★ 5 cited
Uniform subellipticity
A. F. M. ter Elst, Derek W. Robinson
We establish two global subellipticity properties of positive symmetric second-order partial differential operators on $L_2(\Ri^d)$. First, if $m \in \Ni$ then we consider operator…
math.AP2006★ 3 cited
Dirichlet forms and degenerate elliptic operators
A. F. M. ter Elst, Derek W. Robinson, Adam Sikora +1
It is shown that the theory of real symmetric second-order elliptic operators in divergence form on $\Ri^d$ can be formulated in terms of a regular strongly local Dirichlet form ir…
math.AP2006
Second-order operators with degenerate coefficients
A. F. M. ter Elst, Derek W. Robinson, Adam Sikora +1
We consider properties of second-order operators on $\Ri^d$ with bounded real symmetric measurable coefficients. We assume…