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Selbstadjungierte Relations‐Erweiterungen für eine Klasse von symmetrischen Differential‐Funktional‐Operatoren
Author(s) -
Timmel Joachim
Publication year - 1985
Publication title -
mathematische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 50
eISSN - 1522-2616
pISSN - 0025-584X
DOI - 10.1002/mana.19851200104
Subject(s) - mathematics , constructive , linear subspace , extension (predicate logic) , pure mathematics , differential (mechanical device) , physics , computer science , process (computing) , thermodynamics , programming language , operating system
Symmetry‐ and selfadjointness‐conditions are derived for ordinary differential‐integral‐interface operators under integral‐interface conditions. Criteria for the existence of selfadjoint extensions in L n 2 × L n 2are given. These extensions are characterized in a constructive way. The main tools are some extension‐theorems for linear relations (subspaces), wich are developed in section 2.