All popes, and in fact all people, are infallible whenever they teach the truth. Correct? Yes, correct.
Popes are infallible, in the sense that cackling Protestants never seem to able to learn, when they define Church doctrine that must be adhered to by all. Those times are extremely rare.
I will be infallible several times today. So will you. Right now I have the TV on. If I say, "I have the TV on," I am infallible on that point. That's a positive form of infalliblity. The infallibility exercized by popes is negative in form - the Holy Spirit protects them from defining error for all of us to believe.
In any case, I usually expect error from you folks, and you rarely disappoint. Worse, you usually don't disappoint while being needlessly derisive about what you clearly don't understand.
But that's not the 'doctrine of infallibility'.
when they define Church doctrine that must be adhered to by all.
So if the Pope woke up tomorrow and said "Doctrine says that the Earth is flat." he would be infallible?
Those times are extremely rare.
Tell that to Galileo or Copernicus.
L