Conditionals and Entailment
Conditional Sentences, Conditionals and Counterfactuals, Faithful and Fruitful Logic, Nomic Dependencies & Contrary-to-fact Conditio, Paradoxes of Material Implication, Peirce and Philo, Relevance Logic
Contradiction and Inconsistency
Conflict without Contradiction: Noncontradiction a, Dialetheism, Metaphilosophical Pluralism and Paraconsistency: F, Paraconsistent Logic, Universiteit van Tilburg: On Partial and Paraconsi
Identity
Do Sentences Have Identity?, Quantum Mechanics and the Identity of Indiscernibl, Relative Identity, The Identity of Indiscernibles, The Paradox of Identity, Tractarian Reflections on the Identity of Indiscer
Informal Logic
About.com - Logical Fallacies, Fallacies, Informal Fallacies, Informal Logic, Logic and Diagnostic, Logic and Fallacies, Logical Fallacies .Info, Logical Rudeness, PRIME: Fallacies, Propaganda Analysis
Logic and Knowledge
Between Logic and Heuristic, Conceptanalysis, Language and Logic, Critics of the Model Theory of Deduction, Logic and Artificial Intelligence
Logic and Ontology
Natural Kinds, Logic and Formal Ontology, Logic and Sachverhalte, Meaning and the Problem of Universals
Paradoxes
Curry's Paradox, Logical Paradoxes .Info, Paradox or Fallacy, Paradoxes, Paradoxes and Dilemmas, Russell's Paradox, Some Endeavours at Synthesising a Solution to the , Some Paradoxes, Sorites Paradox, The Berry Paradox and Godel's Incompleteness
Problem of Induction
A Constructivist Approach to the Problem of Induct, Confirmation Theory, Conjectures, Mathematical Induction, The Problem of Induction
Semantics of Logic
Assigning Meaning to Proofs, Interpreting Formal Logic, On the Meaning of the Logical Constants and the Ju, Satisfaction, The Meanings of Logical Constants, Torkel Franzén's Homepage, What Can't Be Evaluated, Can't Be Evalua
Truth Definitions
Coherence Theory of Truth, Correspondence Theory of Truth, Deflationary Theory of Truth, Identity Theory of Truth, In Spite of Davidson's Arguments for `The Fol, Revision Theory of Truth, The Diamond Theory of Truth, The Semantical Conception of Truth, Truthlikeness, What is Truth?
Vagueness
Brian Weatherson's Vagueness Page, How to Make Our Ideas Clear, Liars and Heaps: The Logic and Semantics of Parado, Russell on Vagueness, Vague Concepts and Sorites Paradoxes, Vagueness, Vagueness and Ambiguity, Vagueness and Identity, Vagueness and the Sorites Paradox, Vagueness and the Sorites Paradox
Frege's Theorem
Article in the Stanford Encylcopaedia of Philosophy, entitled `Frege's Logic, Theorem, and Foundations for Arithmetic'. Discusses the 1980 discovery of Crispin Wright that Frege's work of the Grundgesetze can be carried out in second-order logic with Hume's principle.
Humboldt State University: Argumentation and Criti
Jay VerLinden's resource offering reviews and tests on important concepts in formal logic.
Logic
An online textbook by Garth Kemerling, explaining the basic elements of elementary logic at an undergraduate level.
Logic and Mathematics
Essay on the nature of logic and its relationship to the philosophy of mathematics, written by Stephen G. Simpson.
Nordic Journal of Philosophical Logic (NJPL)
Edited at Dep. of Philosophy, Univ. of Oslo, published by Scandinavian U.P. in hard copy and on WWW. Full-text Web edition free for personal use.
Peirce's Logic
Article in the Stanford Encyclopaedia of Philosophy, by Eric Hammer.
Philosophical Logic
Introductory article by E. J. Loewe.
Symbolic Logic
Online resources provided to supplement undergraduate course taught by Peter Suber. Good collection of handouts.
The Logic Course
An interactive course in formal logic, with tutorials and quizzes on critical thinking, truth-tables, and sentential.
The Troublesome Paradox
Online version of book seeking publication by Per Lundgren. Author attempts to argue that a consequence of Goedel's incompleteness theorem is that we should overturn our current approach to scientific method.
Tips on Translating English into First-Order Logic
An introductory guide by Peter Suber.
Why Aristotelian Logic does not Work
An essay at Abelard.org outlining an argument against Aristotelian syllogistic. The argument focusses upon the relationship between Aristotle's categories and his conception of being, attacking them from an idealist position drawing upon Brouwerian intuitionism and some Zen philosophy.