. . . . . . "Plato's definition of knowledge" . . . "thought experiments by Edmund Gettier" . . "Gettier" . . "problems" . "Gettier problem#The Pyromaniac" . . "Gettier problem#Cow in the Field" . "Gettier problem" . . . "Gettier problem#The sheep in the field" . "Gettier cases" . . "Gettier problem#Fake barns" . . "Is Justified True Belief Knowledge?" . . "Gettier problem" . .