Dedekind cotangent sums
Matthias Beck (2003)
Acta Arithmetica
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Matthias Beck (2003)
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Abdelmejid Bayad, Abdelaziz Raouj (2010)
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Alfonz Haviar, Gabriela Monoszová (2001)
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In this paper we investigate varieties of orgraphs (that is, oriented graphs) as classes of orgraphs closed under isomorphic images, suborgraph identifications and induced suborgraphs, and we study the lattice of varieties of tournament-free orgraphs.
Don Zagier (1973)
Mathematische Annalen
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Manfred Kühleitner, Werner Georg Nowak (2001)
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Jaroslav Ježek, Václav Slavík (2005)
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We prove that the lattice of varieties contains almost no compact elements.
Norman R. Reilly, Roger Wroblewski (1981)
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Robert Sczech (1994)
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L.J. Mordell (1930)
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Benji Fisher (1995)
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B.R. SRINIVASAN (1965)
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