.FailureModes.SingularModels.GroundlessCircuit1 .FailureModes.SingularModels.GroundlessCircuit1This simple DC circuit model lacks a ground component, so its equations are singular. On the other hand, it has infinitely many solutions, whereby the circulating current is 1 A and the voltage difference across the two components is 1 V.
There are two acceptable results for this model. Either a meaningful error message like "Missing ground component in system" is issued, or the tool can somehow process the equations so as to compute one valid solution, possibly warning the user that this is just one of multiple possible solutions. See paper 1, Section 5 and paper 2, Section 5 for some ideas how to obtain these results.