Germ\'an Ancochea's work on projectivities, harmonicity preservers and semi-homomorphisms
arxiv（2020）
摘要
Our main aim is to analyse three articles of Germ\'an Ancochea (published 1941, 1942 and 1947) and to describe their impact in algebra and geometry.
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关键词
harmonicity preservers,projectivities,semi-homomorphisms
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