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.
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.
Non Standard Logics A comprehensive listing of flavours of non-standard logic with brief descriptions and references, compiled by Peter Suber.
