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-ord
http://plato.stanford.edu/entries/frege-logic/index.htmlLogic
An online textbook by Garth Kemerling, explaining the basic elements of elementary logic at an undergraduate level.
http://www.philosophypages.com/lg/
Logic and Mathematics
Essay on the nature of logic and its relationship to the philosophy of mathematics, written by Stephen G. Simpson.
http://www.math.psu.edu/simpson/papers/philmath/
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.
http://www.hf.uio.no/filosofi/njpl/
Peirce's Logic
Article in the Stanford Encyclopaedia of Philosophy, by Eric Hammer.
http://plato.stanford.edu/entries/peirce-logic/
PHILOG
The Danish Network for Philosophical Logic and its Applications.
http://www.philog.ruc.dk/
Philosophical Logic
Introductory article by E. J. Loewe.
http://www.dur.ac.uk/~dfl0www/modules/logic/PHILLOG.HTM
Symbolic Logic
Online resources provided to supplement undergraduate course taught by Peter Suber. Good collection of handouts.
http://www.earlham.edu/~peters/courses/log/loghome.htm
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.
http://www.yesgoyes.com/
Tips on Translating English into First-Order Logic
An introductory guide by Peter Suber.
http://www.earlham.edu/~peters/courses/log/transtip.htm
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 Brouwer
http://www.abelard.org/category/category.htm
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