The solution exists only for an ideal OP without any bandwidth limitation, means it will be never observed with a real OP. There have been several previous threads about the paradox behaviour of ideal OP circuits with positive feedback.I have runned a simulation(see picture)
Just a matter of level of abstraction. You can simulate the problem with an "ideal" OP (e.g. infinite voltage swing). And as said, even get a finite solution with positive feedback if the OP has no bandwidth limitation.Nobody noticed that the opamp is missing a power supply so it won't do a darn thing.
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