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Based on the theory of ball spaces introduced by Kuhlmann and Kuhlmann we introduce and study Caristi-Kirk and Oettli-Th��ra ball spaces. We show that if the underlying metric space is complete, then these have a very strong property: every ball
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::66cf17d9a23b95c72299dd51014e5249
