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Directory Sites

Non Standard Logics
A comprehensive listing of flavours of non-standard logic with brief descriptions and references, compiled by Peter Suber.
www.earlham.edu
Infinitary Logic
Article in the Stanford Encyclopaedia of Philosophy by John L. Bell. Infinitary Logic is a branch of formal logic where finitary formulae are replaced by potentially infinitary mathematical entities.
plato.stanford.edu
Logic System Interrelationships
Shows how a number of representative logics fit together. The interrelationships usually given as something of the form: System X is system Y plus the axiom Z. By John Halleck.
www.cc.utah.edu
What are Weak Arithmetics
Notes defining the subject. Available in HTML and PS formats.
www.univ-paris12.fr
Computability Logic
Wikipedia (free encyclopedia) article.
en.wikipedia.org

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