Volume 13, Issue 3 Svetlin Georgiev Georgiev Karima Mebarki Leggett-Williams fixed point theorem type for sums of operators and application in PDEs Downloads Abstract PDF Full article PDF DOI { copied = true; setTimeout(() => copied = false, 2000) })" :aria-label="copied ? 'DOI copied' : 'Copy DOI'" :title="copied ? 'Copied' : 'Copy DOI'" > Find all available articles from these authors Svetlin Georgiev Georgiev Karima Mebarki Find more articles with the same keywords fixed point index cone sum of operators Green function PDEs Find more articles with the same subject classes 47H10 47H08 35L15