Lebesgue type decompositions for linear relations and Ando's uniqueness criterion

Seppo Hassi, Zoltán Sebestyén, Henk de Snoo

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…