On the set of values of the Euler function.
Tasoev, B.G. (1999)
Vladikavkazskiĭ Matematicheskiĭ Zhurnal
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Tasoev, B.G. (1999)
Vladikavkazskiĭ Matematicheskiĭ Zhurnal
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Florian Luca, Pantelimon Stănică (2007)
Acta Arithmetica
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William D. Banks, John B. Friedlander, Florian Luca, Francesco Pappalardi, Igor E. Shparlinski (2006)
Acta Arithmetica
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William D. Banks, Florian Luca (2005)
Acta Arithmetica
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Hao Pan, Zhi-Wei Sun (2006)
Acta Arithmetica
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Światosław R. Gal (2001)
Colloquium Mathematicae
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A closed form formula (generating function) for the Euler characteristic of the configuration space of n particles in a simplicial complex is given.
Arrigo Cellina (2017)
Annales Mathematicae Silesianae
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We present some results and open problems in the Calculus of Variations.
Sz. Tengely (2008)
Acta Arithmetica
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Hirotaka Akatsuka (2006)
Acta Arithmetica
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Ji-Cai Liu (2017)
Czechoslovak Mathematical Journal
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Euler's pentagonal number theorem was a spectacular achievement at the time of its discovery, and is still considered to be a beautiful result in number theory and combinatorics. In this paper, we obtain three new finite generalizations of Euler's pentagonal number theorem.
Miloš Čanak (1994)
Matematički Vesnik
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Ian M. Anderson (1978)
Aequationes mathematicae
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Takaharu Yaguchi (2013)
ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique
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We propose a Lagrangian approach to deriving energy-preserving finite difference schemes for the Euler–Lagrange partial differential equations. Noether’s theorem states that the symmetry of time translation of Lagrangians yields the energy conservation law. We introduce a unique viewpoint on this theorem: “the symmetry of time translation of Lagrangians derives the Euler–Lagrange equation and the energy conservation law, simultaneously.” The proposed method is a combination of a discrete...
A. R. Sarpe (1972)
Matematički Vesnik
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Hoang Ngoc Minh, Jacob, Gérad, Petitot, Michel, Oussous, Nour Eddine (1999)
Séminaire Lotharingien de Combinatoire [electronic only]
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Arrigo Cellina (2005)
Bollettino dell'Unione Matematica Italiana
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We consider the necessary conditions in the Calculus of Variations, expressed by the validity of the Euler Lagrange equation, or of the Pontriagin Maximum Principle; in particular, problems on multi-dimensional domanis are considered.
Popescu, M., Popescu, P. (2000)
Balkan Journal of Geometry and its Applications (BJGA)
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Udrişte, C., Postolache, M., Ţevy, I. (2001)
Balkan Journal of Geometry and its Applications (BJGA)
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