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mathhelpforum.com

Kurepa's conjecture states that for any prime number p > 2, we have 0! + 1! + \ldots + (p - 1)! \not\equiv 0 \pmod{p} We let !p denote the expression on the left-hand side. We call it the left factorial of p. We do not know any infinite set of prime numbers for which the conjecture holds...

matematiques.com.br

Data da última atualização 26/08/2024

mathworld.wolfram.com

A connected graph G is distance-regular if for any vertices x and y of G and any integers i,j=0, 1, ...d (where d is the graph diameter), the number of vertices at distance i from x and distance j from y depends only on i, j, and the graph distance between x and y, independently of the choice of x and y. In particular, a distance-regular graph is a graph for which there exist integers b_i,c_i,i=0,...,d such that for any two vertices x,y in G and distance i=d(x,y), there are exactly c_i...

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uff.br

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