I was looking through some problems in Nilsson's book and this one caught my attention:
The variable of the dependente source is in the \$4\Omega\$ resistor, which is part of a "delta" type of resistor's network. If I perform the delta-wye transformation: (1) the resistance values would change; (2) the variable could be in two different resistors. I made a simple simulation of another delta network comparing with the wye equivalente and the current values were very distinct, the topology of the circuit was also very different .The original problem wants you to use SPICE, but I am curious on how to deal with it theoretically, or if it is possible to perform the transformation in this case. Thanks for your attention.