A canonical decomposition for linear operators and linear relations

Details A canonical decomposition for linear operators and linear relations A canonical decomposition for linear operators and linear relations

2006-11-02

arxiv.org/abs/math/0611045v1

Mathematics

Functional Analysis

to appear in Acta Math. Hungarica, volume 116(1-2)

Scientific paper

An arbitrary linear relation (multivalued operator) acting from one Hilbert space to another Hilbert space is shown to be the sum of a closable operator and a singular relation whose closure is the Cartesian product of closed subspaces. This decomposition can be seen as an analog of the Lebesgue decomposition of a measure into a regular part and a singular part. The two parts of a relation are characterized metrically and in terms of Stone's characteristic projection onto the closure of the linear relation.

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