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Properties of digraphs connected with some congruence relations

J. Skowronek-Kaziów (2009)

Czechoslovak Mathematical Journal

The paper extends the results given by M. Křížek and L. Somer, On a connection of number theory with graph theory, Czech. Math. J. 54 (129) (2004), 465–485 (see [5]). For each positive integer n define a digraph Γ ( n ) whose set of vertices is the set H = { 0 , 1 , , n - 1 } and for which there is a directed edge from a H to b H if a 3 b ( mod n ) . The properties of such digraphs are considered. The necessary and the sufficient condition for the symmetry of a digraph Γ ( n ) is proved. The formula for the number of fixed points of Γ ( n ) is established....

Résidus de puissances et formes quadratiques

Dominique Bernardi (1980)

Annales de l'institut Fourier

Pour tout entier q et certains entiers n , les nombres premiers p - congrus à 1 modulo n - tels que q soit le résidu d’une puissance n -ième modulo p sont caractérisés par le fait que certains systèmes de φ ( n ) / 2 formes quadratiques à coefficients entiers en φ ( n ) variables représentent le φ ( n ) / 2 -uplet ( p , 0 , 0 ... , 0 ) . La démonstration de ce résultat est accompagnée d’une méthode explicite de construction de ces systèmes.

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