are at 0 V, then the emitters must be at -0.7 V.
This condition is required to forward-bias the
base-emitter junctions anti turn on the transistors.
Saying that the emitter is 0.7 V with respect
to the base is the same as saying that the base is
+0.? V with respect to the emitter. This satisfies
the bias requirements for NPN transistors.