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Hi, I'm having some trouble determining whether or not a BJT (used in an amplifier topology for example) is in forward active, given that we don't know what the base-emitter and base-collector voltages are (we might know how they are related). My textbook likes to argue: assume it is in forward active and then verify that the conditions for forward active mode hold true. This doesn't seem like the way you prove statements (show that true implies true) - rather we should assume that the equations for forward active mode do not hold and then show that the transistor is not in forward active. However, if we assume the equations for forward active mode do not hold, we have no further relations to relate the base-emitters and base-collector voltages to determine the mode of operation...