| 1. | Mathematical Logic and Foundations | | | From The Mathematical Atlas, a resource of mathematics maintained by David Rusin. Extensive resources related to logic and set theory. www.math.niu.edu |
| 2. | Abstract Service | | | An archive of abstracts of logic articles at the Institute for Logic, University of Vienna. www.logic.univie.ac.at |
| 3. | Math Front: LO Logic | | | Front end for the logic section of the mathematics e-print arXiv. front.math.ucdavis.edu |
| 5. | Classical Logic | | | Introduction to classical logic, including completeness and Löwenheim-Skolem theorems; by Stewart Shapiro. plato.stanford.edu |
| 6. | Logic and Games | | | Survey of game-theoretical approaches to logic; by Wilfrid Hodges. plato.stanford.edu |
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