Tripletas asociadas a diagramas de nudos virtuales

abstract. in this paper we study the set t of triplets (e,a,b), where e ∈ {-1, 1}n, a ∈ ？n and b is an integral antisymmetric matrix of order n, n ∈ ？∪{0}. we define an equivalence relation on the set t and then we study properties of its equivalence classes. we describe a method to assign to each virtual knot diagram a triplet, and this is the motivation to study the set of triplets. as the assignation of a triplet depends on the virtual knot diagram, it is not a virtual knot invariant. but we try to solve this problem by using the equivalence relation defined on t.