A point set characterization of closed 2-dimensional manifolds
J. Roberts (1932)
Fundamenta Mathematicae
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J. Roberts (1932)
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Hugo Steinhaus (1954)
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Hassler Whitney (1937)
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John Cobb (1988)
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John Kline (1927)
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A centrally symmetric plane curve has a point called it’s centre of symmetry. We define (following Janeczko) a set which measures the central symmetry of an arbitrary strictly convex plane curve, or surface in . We investigate some of it’s properties, and begin the study of non-convex cases.
Edward James McShane (1934)
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze
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Marston Morse, J. Jenkins (1952)
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