Anti-foundationalism – Epistemology without sure premises

Cognitive closure (philosophy) – Proposition in philosophy of mind

Critical rationalism – Epistemological philosophy advanced by Karl Popper

Duhem–Quine thesis – Principle in the philosophy of science

Problem of the criterion – Philosophical problem about the starting point of knowledge

Regress argument – Philosophical problem

Theory of justification – Concept in epistemology

"What the Tortoise Said to Achilles" – Allegorical dialogue by Lewis Carroll