Real quartic surfaces containing 16 skew lines.
Nieto, Isidro (2004)
International Journal of Mathematics and Mathematical Sciences
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Nieto, Isidro (2004)
International Journal of Mathematics and Mathematical Sciences
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Teruo Nagase, Akiko Shima (2005)
Fundamenta Mathematicae
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Let Γ be a 4-chart with at most two crossings. We show that if the closure of the surface braid obtained from Γ is one 2-sphere, then the sphere is a ribbon surface.
Itoh, Jin-ichi, Sinclair, Robert (2004)
Experimental Mathematics
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Ulmet, Dan-Eugen (2004)
International Journal of Mathematics and Mathematical Sciences
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M. P. Dussan, M. Magid (2010)
Annales Polonici Mathematici
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We characterize the Christoffel pairs of timelike isothermic surfaces in the four-dimensional split-quaternions. When restricting the receiving space to the three-dimensional imaginary split-quaternions, we establish an equivalent condition for a timelike surface in ℝ³₂ to be real or complex isothermic in terms of the existence of integrating factors.
Jurii I. Manin (1966)
Publications Mathématiques de l'IHÉS
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O. Karwowski (1964)
Annales Polonici Mathematici
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Szilvási-Nagy, Márta, Béla, Szilvia, Mátyási, Gyula (2008)
Annales Mathematicae et Informaticae
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Hari das Bagchi, Biswarup Mukherji (1952)
Rendiconti del Seminario Matematico della Università di Padova
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Udo Simon, Konrad Voss, Luc Vrancken, Martin Wiehe (2002)
Banach Center Publications
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We investigate pairs of surfaces in Euclidean 3-space with the same Weingarten operator in case that one surface is given as surface of revolution. Our local and global results complement global results on ovaloids of revolution from S-V-W-W.
Robert Connelly (1977)
Publications Mathématiques de l'IHÉS
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Marian Munteanu, Ana Nistor (2011)
Open Mathematics
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In the present paper we classify all surfaces in 3 with a canonical principal direction. Examples of this type of surfaces are constructed. We prove that the only minimal surface with a canonical principal direction in the Euclidean space 3 is the catenoid.
Jorge L. Arocha, Javier Bracho, Natalia García-Colín, Isabel Hubard (2015)
Discussiones Mathematicae Graph Theory
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The intersection matrix of a simplicial complex has entries equal to the rank of the intersecction of its facets. We prove that this matrix is enough to define up to isomorphism a triangulation of a surface.
P. C. Craighero, R. Gattazzo (1989)
Rendiconti del Seminario Matematico della Università di Padova
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