- 19th century
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- A Greek-English Lexicon
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- ACM Computing Classification System
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- Index of logic articles
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- List of logic journals
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- List of logic symbols
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- List of logicians
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- Mīmāṃsā
- Name
- Nathaniel Rochester (computer scientist)
- Natural language
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- Nicholas Rescher
- Nicolai A. Vasiliev
- Nihilism
- Nimbarka Sampradaya
- Nominalism
- Non-classical logic
- Norm (philosophy)
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- Nuel Belnap
- Nyaya
- OCLC (identifier)
- Objective idealism
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- Occamism
- On Truth and Lies in a Nonmoral Sense
- Online Etymology Dictionary
- Ontology
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- Organization
- Organon
- Outline of academic disciplines
- Outline of logic
- Outline of logic
- Outline of mathematics
- Outline of mathematics
- Outline of philosophy
- Outline of philosophy
- Oxford University Press
- P.D. Magnus
- Pain (philosophy)
- Pakistani philosophy
- Paraconsistent logic
- Paradox
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- Peripatetic school
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- Petr Hájek
- Phenomenology (philosophy)
- PhilPapers
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- Philosophy
- Philosophy
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- Philosophy of Mind
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- Philosophy of medicine
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- Philosophy of sex
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- Philosophy of space and time
- Philosophy of sport
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- Philosophy of war
- Physicalism
- Pierre Nicole
- Plato
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- Port-Royal Logic
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- Pragma-dialectics
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- Pre-Socratic philosophy
- Predicable
- Predicate calculus
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- Premise
- Principia Mathematica
- Principle of bivalence
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- Principles of Mathematical Logic
- Prior Analytics
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- Problem of future contingents
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- Process philosophy
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- Prolog
- Proof calculus
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- Proposition
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- Psychologism
- Pyrrhonism
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- Qin dynasty
- Quantification (logic)
- Quantifier (logic)
- Quantum logic
- Quietism (philosophy)
- Rationalism
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- Realism versus anti-realism
- Reality
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- Reason
- Recursion theory
- Reductio ad absurdum
- Reductionism
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- Reformed epistemology
- Relational semantics
- Relativism
- Relevance logic
- Renaissance humanism
- Renaissance philosophy
- Rhetoric
- Robert Brandom
- Robert Scott (philologist)
- Romanian philosophy
- Routledge
- Rule induction
- Rule of inference
- Russell's paradox
- Russian cosmism
- Sage (philosophy)
- Samkhya
- Saul Kripke
- Sautrāntika
- Scholastic logic
- Scholasticism
- School of Names
- School of Naturalists
- Scientific realism
- Scientism
- Scotism
- Second-order logic
- Semantic theory of truth
- Semantics
- Semantics of logic
- Set theory
- Sextus Empiricus
- Shuddhadvaita
- Skeptical movement
- Social constructionism
- Social contract
- Social philosophy
- Socialism
- Solipsism
- Sophist
- Soundness
- Spanish philosophy
- Spinozism
- Square of opposition
- Stanford Encyclopedia of Philosophy
- Stanislaw Schayer
- Statement (logic)
- Stephen Cole Kleene
- Stephen Toulmin
- Stewart Shapiro
- Stoic logic
- Stoicism
- Stoics
- Strict implication
- Structural proof theory
- Structuralism
- Subjective idealism
- Subjectivism
- Substitution (logic)
- Sufi philosophy
- Sum of Logic
- Supervaluationism
- Supposition theory
- Susan Haack
- Svatantrika–Prasaṅgika distinction
- Syllogism
- Syllogistic logic
- Symbolic Logic
- Syntax
- Syntax (logic)
- Systemics
- Taoism
- Taoist philosophy
- Tautology (logic)
- Temporal logic
- Tense logic
- Term logic
- Terminology
- Ternary logic
- Tetralemma
- The Gay Science
- The Laws of Thought
- The Monist
- Theoretical philosophy
- Theories of humor
- Theory of art
- Thomism
- Topics (Aristotle)
- Transactionalism
- Transcendental idealism
- Transcendentalism
- Truth
- Truth
- Truth value
- Turing degree
- Turkish philosophy
- Universal logic
- Universal quantification
- Universal quantifier
- University of Hawaii Press
- Utilitarianism
- Vaisheshika
- Validity (logic)
- Vector logic
- Vector logic
- Vedanta
- Vienna Circle
- Vietnamese philosophy
- Virtue ethics
- Vishishtadvaita
- W. V. Quine
- Walter Burley
- Wayback Machine
- Western Marxism
- Western philosophy
- Wilfred Hodges
- Wilfred Sellars
- Wilhelm Ackermann
- Willard Van Orman Quine
- William Kneale (logician)
- William Wallace (Scottish philosopher)
- William of Ockham
- Women in philosophy
- Xuanxue
- Yangism
- Yoga Sutras of Patanjali
- Yogacara
- Yogachara
- Zoroastrianism
- Zurvanism
- Ājīvika
- Śūnyatā