R
Ramism -- Rationality -- Razor (philosophy) -- Reason -- Reductio ad absurdum -- Reference -- Reflective equilibrium -- Regression fallacy -- Regular modal logic -- Reification (fallacy) -- Relativist fallacy -- Relevance -- Relevance logic -- Relevant logic -- Remarks on the Foundations of Mathematics -- Retroduction -- Retrospective determinism -- Revolutions in Mathematics -- Rhetoric -- Rigour -- Rolandas Pavilionis -- Round square copula -- Rudolf Carnap -- Rule bank -- Rule of inference -- Rvachev function --
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