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A puzzle relating to physical equations or physical principles such as energy, entropy, and classical/quantum mechanics. General physics questions are off-topic here but can usually be asked at Physics Stack Exchange.

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If we have multiple copies of each of the unknown resistors (so we can use the variables $x$ and $y$ more than once in the mathematical formulation), and we allow complex-valued resistors, then this i …
answered Apr 6 '16 by Julian Rosen