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...born 1962 in England) is a British-Canadian mathematician, specializing in variational analysis and nonsmooth optimization.<ref name=Bio>{{cite web|title=Biograph ...ed and Variational Analysis''<ref>{{cite web|title=Editors, Set-Valued and Variational Analysis|website=Springer|url=https://www.springer.com/journal/11228/editor ...

...to Google Scholar and remains the standard reference on the subject, and "Variational Analysis" (1998, with [[Roger J-B <!-- no periods! --> Wets]]) for which th ...ons Research and the Management Sciences]] (INFORMS) in 1998 for the book "Variational Analysis." In 1999, he was awarded the [[John von Neumann Theory Prize]] fr ...

...nglish, and other languages. Ekeland is known as the author of [[Ekeland's variational principle]] and for his use of the [[Shapley–Folkman lemma]] in [[optimizat Ekeland has contributed to [[mathematical analysis]], particularly to [[variational calculus]] and [[mathematical optimization]]. ...

[[Category:Italian mathematical analysts]] [[Category:Variational analysts]] ...

...and is unique or not: he explicitly invited young [[mathematical analysis|analysts]] to study the problem.<ref>As it is stated in {{harv|Signorini|1959|p=129} ...problem coincides with the birth of the field of [[Variational inequality|variational inequalities]].<ref>According to {{Harvtxt|Antman|1983|p=282}}</ref> ...

...stituting the [[Integral operator|kernel of the integral operator]] by its variational-difference approximation, so that the [[Resolvent formalism|resolvent]] of |title = Variational methods in mathematical physics ...

*[[Variational inequalities]] ...olution of the [[Signorini problem]] and the foundation of the theory of [[variational inequalities]]. Fichera's relations with Severi were not as friendly as wit ...