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- W2781971695 abstract "A linear relation, i.e., a multivalued operator $T$ from a Hilbert space ${mathfrak H}$ to a Hilbert space ${mathfrak K}$ has Lebesgue type decompositions $T=T_{1}+T_{2}$, where $T_{1}$ is a closable operator and $T_{2}$ is an operator or relation which is singular. There is one canonical decomposition, called the Lebesgue decomposition of $T$, whose closable part is characterized by its maximality among all closable parts in the sense of domination. All Lebesgue type decompositions are parametrized, which also leads to necessary and sufficient conditions for the uniqueness of such decompositions. Similar results are given for weak Lebesgue type decompositions, where $T_1$ is just an operator without being necessarily closable. Moreover, closability is characterized in different useful ways. In the special case of range space relations the above decompositions may be applied when dealing with pairs of (nonnegative) bounded operators and nonnegative forms as well as in the classical framework of positive measures." @default.
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- W2781971695 date "2018-01-04" @default.
- W2781971695 modified "2023-09-23" @default.
- W2781971695 title "Lebesgue type decompositions for linear relations and Ando's uniqueness criterion" @default.
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