The circuit determinant \(\Delta\) is the determinant of the matrix description of the circuit. The latter is the matrix form of a general cutset of the circuit. In particular:

- The mesh equations, in which the driving sources are voltages.
- The nodal equations, in which the driving sources are currents.
- The indefinite admittance matrix, defined by Chen.
- ...

The determinant is not invariant among these different formulations, however, each one features the same roots (poles of the circuit) if it describes the same circuit.

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