Extended sums and extended compositions of monotone operators

Yboon García, Marc Lassonde, Julian P. Revalski

Research output: Contribution to journalArticle in a journalpeer-review

15 Scopus citations


We study extended notions for sums of monotone operators and for precompositions of monotone operators with continuous linear mappings. First, we establish some new properties related to the notion of extended sum recently proposed by Revalski and Théra, among them the monotonicity of this sum provided the operators involved are maximal monotone. Then, we show that the equivalence which exists between usual sums and compositions remains valid also for the extended operations. This allows us to obtain some known and new results for extended compositions via the corresponding properties of extended sums.
Original languageEnglish
Pages (from-to)721-738
Number of pages18
JournalJournal of Convex Analysis
Issue number3-4
StatePublished - 1 Dec 2006
Externally publishedYes


  • Compositions
  • Enlargements
  • Extended sums of monotone operators
  • Monotone operators
  • Subdifferentials


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