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math.FA2025
A product of strongly quasi-nonexpansive mappings in Hadamard spaces
Wiparat Worapitpong, Parin Chaipunya, Poom Kumam +1
In this paper, we prove that the product of strongly quasi-nonexpansive -demiclosed mappings is also a strongly quasi-nonexpansive orbital -demiclosed mapping in Hadamard s…
math.FA2025
Variational principles using a non-symmetric non-triangular distance
Natthaya Boonyam, Parin Chaipunya, Poom Kumam
We consider Borwein-Preiss and Ekeland variational principles using distance functions that neither is symmetric nor enjoy the triangular inequality. All the given results rely exc…