On the counting of $O(N)$ tensor invariants
On the counting of $O(N)$ tensor invariants
O(N ) invariants are the observables of real tensor models.We use regular colored graphs to represent these invariants, the valence of the vertices of the graphs relates to the tensor rank.We enumerate O(N ) invariants as d-regular graphs, using permutation group techniques.We also list their generating functions and give (software) …