I B 0 = I B 1 I_{B0} = I_{B1} IB0=IB1 I C 0 = I C 1 I_{C0} = I_{C1} IC0=IC1
I C 0 = β β + 2 I R I_{C0} = \frac{\beta}{\beta + 2}I_{R} IC0=β+2βIR
