5 citations · 8 across the 7 of their papers we have counts for
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The Krein-von Neumann Extension of a Regular Even Order Quasi-Differential Operator
Minsung Cho, Seth Hoisington, Roger Nichols +1
We characterize by boundary conditions the Krein-von Neumann extension of a strictly positive minimal operator corresponding to a regular even order quasi-differential expression o…
Donoghue -functions for singular Sturm--Liouville operators
Fritz Gesztesy, Lance L. Littlejohn, Roger Nichols +2
Let be a densely defined, closed, symmetric operator in the complex, separable Hilbert space with equal deficiency indices and denote by $\mathcal{N}_i = \ke…
On Absence of Threshold Resonances for Schrodinger and Dirac Operators
Fritz Gesztesy, Roger Nichols
Using a unified approach employing a homogeneous Lippmann-Schwinger-type equation satisfied by resonance functions and basic facts on Riesz potentials, we discuss the absence of th…
The limiting absorption principle for massless Dirac operators, properties of spectral shift functions, and an application to the Witten index of non-Fredholm operators
Alan Carey, Fritz Gesztesy, Galina Levitina +3
We derive a limiting absorption principle on any compact interval in for the free massless Dirac operator, in $[L^2(\mathbb…
A survey of some norm inequalities
Fritz Gesztesy, Roger Nichols, Jonathan Stanfill
We survey some classical norm inequalities of Hardy, Kallman, Kato, Kolmogorov, Landau, Littlewood, and Rota of the type \[ \|A f\|_{\mathcal{X}}^2 \leq C \|f\|_{\mathcal{X}} \big\…
The Krein-von Neumann extension revisited
Guglielmo Fucci, Fritz Gesztesy, Klaus Kirsten +3
We revisit the Krein-von Neumann extension in the case where the underlying symmetric operator is strictly positive and apply this to derive the explicit form of the Krein-von Neum…