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A spherically vicinal mapping on geodesic spaces with curvature bounded above

Takuto Kajimura, Yasunori Kimura


In 2018, vicinal mappings and firmly vicinal mappings were proposed by Kohsaka. He showed fundamental properties of firmly vicinal mappings and a fixed point theorem for those mappings. In this paper, we propose spherically vicinal mappings and firmly spherically vicinal mappings whose classes contain those of vicinal mappings and firmly vicinal mappings, respectively. We also show some examples of its mapping and prove fundamental properties and an approximation theorem to a fixed point.

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The Thai Journal of Mathematics organized and supported by The Mathematical Association of Thailand and Thailand Research Council and the Center for Promotion of Mathematical Research of Thailand (CEPMART).

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|ISSN 1686-0209|