Theaetetus   Concepts in epistemology Knowledge  · Justification  · Belief  · Perception  · A priori knowledge  · Induction  · Other minds  · Analytic-synthetic distinction  · Causality  · Common sense  · Descriptive knowledge  · Gettier problem  · Objectivity  · Analysis  · Proposition  · Regress argument  · Simplicity  · Speculative reason  · Truth