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We generalize the notion of Lagrangian subspaces to self‐orthogonal subspaces with respect to a (skew‐) symmetric form, thus characterizing (skew‐)self‐adjoint and unitary operators by means of self‐orthogonal subspaces. By orthogonality preserving mappings, these characterizations can be transferred to abstract boundary value spaces of (skew‐)symmetric operators. Introducing the notion of boundary...
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