Can you help me to understand this thevenin circuit's mesh?

Why didn't we involve the 4 Ohm resistor while doing the mesh i2 ?

• A mistake? Slip of the pen?
– G36
Dec 17 '20 at 20:52
• I have no idea, I thought maybe it's because that part is an open circuit, so Dec 17 '20 at 20:56
• No, what is the answer for the Thevenin voltage? And $V_\phi$ is?
– G36
Dec 17 '20 at 20:58
• Vϕ is 20V, Voc is 120V ,i source(when you make it a short circuit)=40 ohm, Rth is 3 ohm, Vth is 60 Volt Dec 17 '20 at 21:05
• I meant, what is the "parameter" for $V_\phi = 4\Omega \times I_1 \times What$
– G36
Dec 17 '20 at 21:07