Cineradiographic Circle Unit: Grantee Invention
نویسندگان
چکیده
منابع مشابه
Unit-circle-preserving mappings
If f is an isometry, then every distance r > 0 is conserved by f , and vice versa. We can now raise a question whether each mapping that preserves certain distances is an isometry. Indeed, Aleksandrov [1] had raised a question whether a mapping f : X → X preserving a distance r > 0 is an isometry, which is now known to us as the Aleksandrov problem. Without loss of generality, we may assume r =...
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ژورنال
عنوان ژورنال: Public Health Reports (1896-1970)
سال: 1966
ISSN: 0094-6214
DOI: 10.2307/4592747