K. Gustafson

activity

20022015

most citedUnbounded Products of Operators and Connections to Dirac-Type Operators

17 citations · 24 across the 4 of their papers we have counts for

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math.FA2015

Conditions Implying Commutativity of Unbounded Self-adjoint Operators and Related Topics

K. Gustafson, M. H. Mortad

Let $B$ be a bounded self-adjoint operator and let $A$ be a nonnegative self-adjoint unbounded operator. It is shown that if $B A$ is normal, it must be self-adjoint and so must be…

math.FA2013★ 17 cited

Unbounded Products of Operators and Connections to Dirac-Type Operators

Karl Gustafson, Mohammed Hichem Mortad

Let $A$ and $B$ be two densely defined unbounded closeable operators in a Hilbert space such that their unbounded operator products $A B$ and $B A$ are also densely defined. Then all…