Hybrid matrix minors from tableau applied to a multiport generalization of NDR related to stability

Grassmann coordinates and a generalization of Cramer´s rule are used to express every minor of every well-defined hybrid H or other description matrix of a linear t-ported network as a quotient of tableau minors. We give a multiple port generalization Green and Willson´s theory that relates the sign of differential resistance of one inserted port to how the DC operating point potential stability changes when the (short or open) termination of the inserted port is changed. The determinant of the hybrid matrix |H| here generalizes resistance. Second, a universal topological formula for all the miners of H (and other descriptions) is given. Matroid theory simplifies some proofs