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Sum of squares of degrees in a graph.

Ábrego, Bernardo M., Fernández-Merchant, Silvia, Neubauer, Michael G., Watkins, William (2009)

JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]

Sums of Powered Characteristic Roots Count Distance-Independent Circular Sets

Zdzisław Skupień (2013)

Discussiones Mathematicae Graph Theory

Significant values of a combinatorial count need not fit the recurrence for the count. Consequently, initial values of the count can much outnumber those for the recurrence. So is the case of the count, Gl(n), of distance-l independent sets on the cycle Cn, studied by Comtet for l ≥ 0 and n ≥ 1 [sic]. We prove that values of Gl(n) are nth power sums of the characteristic roots of the corresponding recurrence unless 2 ≤ n ≤ l. Lucas numbers L(n) are thus generalized since L(n) is the count in question...

Supermagic Graphs Having a Saturated Vertex

Jaroslav Ivančo, Tatiana Polláková (2014)

Discussiones Mathematicae Graph Theory

A graph is called supermagic if it admits a labeling of the edges by pairwise different consecutive integers such that the sum of the labels of the edges incident with a vertex is independent of the particular vertex. In this paper we establish some conditions for graphs with a saturated vertex to be supermagic. Inter alia we show that complete multipartite graphs K1,n,n and K1,2,...,2 are supermagic.

Sur certaines équations fonctionnelles arithmétiques

Régis de La Bretèche, Gérald Tenenbaum (2000)

Annales de l'institut Fourier

Soit p k le k -ième nombre premier. Une fonction arithmétique complètement additive est définie sur * par la donnée des f ( p k ) et la formule f ( n ) = k 1 f ( p k ) v p k ( n ) ( n 1 ) , où v p désigne la...

Sur certains tournois

Guy Chaty (1972)

ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique

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