| http://www.w3.org/ns/prov#value | - The loop currents are Ik, k = 1 to N. If emf V is at port 1 and port 2 is shorted, then Kirchhoff's laws give ??z1kIk = V, and ??zjkIk = 0, j = 2 to N. The current I2 can then be expressed in terms of determinants as I2 = -V det A/??, where the determinant in the numerator has been expanded by minors of the second column, which is all zeros except for V in the first position.
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