262 citations · 606 across the 33 of their papers we have counts for
4 papers · 1 filter
Spectral asymptotics for Robin problems with a discontinuous coefficient
Gerd Grubb
The spectral behavior of the difference between the resolvents of two realizations and of a second-order strongly elliptic symmetric differential operator…
Extension Theory and Krein-type Resolvent Formulas for Nonsmooth Boundary Value Problems
Helmut Abels, Gerd Grubb, Ian Geoffrey Wood
For a strongly elliptic second-order operator on a bounded domain it has been known for many years how to interpret the general closed -realizat…
Extension theory for elliptic partial differential operators with pseudodifferential methods
Gerd Grubb
This is a short survey on the connection between general extension theories and the study of realizations of elliptic operators A on smooth domains in R^n, n > 1. The theory of pse…
Krein-like extensions and the lower boundedness problem for elliptic operators
Gerd Grubb
For selfadjoint extensions tilde-A of a symmetric densely defined positive operator A_min, the lower boundedness problem is the question of whether tilde-A is lower bounded {\it if…