Skepticism is focused on doubting that this is possible.
Robert Nozick came up with four conditions in his "tracking theory" of this concept. Gettier [GET-ee-er] problems are meant to reveal problems for a definition of this concept articulated in Plato's Theaetetus [THEE-uh-TEE- tus], that of "justified true belief." Dependence on experience determines whether this is a posteriori(*) or a priori. Skepticism is focused on doubting that this is possible. Studied by epistemologists, for 10 points, name this state in which an individual is reasonably certain of a belief, the absence of which is ignorance.
Robert Nozick came up with four conditions in his "tracking theory" of this concept.
{knowledge} [or word forms, prompt on equivalents such as “{truth}” or “{true} belief”]