... C,b and C, b and A. It follows that N(Ga, a) = N(G, a) and N(Ga, b) = A ∪ B ∪ {a}.The local complementation at b toggles edges and loops in A, B, {a} and edgesbetween A and B, a and A, a and ... between q and the Martin polynomial) . Under the name of Tutte-Martin polynomial, Bouchet has extended it toisotropic systems and established relations between it and the polynomials q and Q in ... polynomial that generalizes in a unified way the two-variable interlace polynomial defined by Arratia, Bollob´as and Sorkin on the onehand, and a one-variable variant of it defined by Aigner and...