Many Textbooks, Many Systems

The logic engine on which Deductions is built is system-agnostic, which provides a great deal of flexibility. The following textbooks are already configured in Preferences, but you can also select custom language, symbol and rule parameters to get Deductions working how you want!

Screenshot of the general preferences window showing a drop-down menu with a list of the various textbooks that are supported, plus a 'custom' option at the bottom of the list
Screenshot of the main deduction window showing a proof that uses the introduction/elimination system in 'A Modern Logic Primer' by Teller

Free Online Textbooks

An Accessible Introduction to Mathematical Logic (Website)
Tony Roy, California State University, San Bernardino
A Modern Formal Logic Primer (Website)
Paul Teller, University of California, Davis


Introduction/Elimination Systems

The Logic Book, 5th Ed. (Amazon)
Merrie Bergmann, Moor, Nelson: McGraw-Hill, 2008
Logics (Amazon)
John Nolt: Wadsworth, 1996
Symbolic Logic (Amazon)
Dale Jacquette: Wadsworth, 2000

Screenshot of the main deduction window showing a proof that uses the introduction/elimination system in 'Logics' by Nolt
Screenshot of the main deduction window showing a proof that uses the inference/substitution system in 'Logic and Philosophy' by Hausman, Tidman and Kahane

Inference/Substitution Systems

A Concise Introduction to Logic, 10th ed. (Amazon)
Patrick Hurley: Wadsworth, 2008
Introduction to Logic, 13th ed. (Amazon)
Irving M. Copi, Cohen: Prentice-Hall, 2008
Logic and Philosophy: A Modern Introduction, 11th ed. (Amazon)
Alan Hausman, Kahane, Tidman: Wadsworth, 2009
The Power of Logic, 4th ed. (Amazon)
Frances Howard-Snyder, Snyder, Wasserman: McGraw-Hill, 2008


Non-Classical Systems

Modern Logic (Intuitionist) (Amazon)
Graeme Forbes: Oxford, 1994
nLab (Minimal) (Website)
I. Johansson, 1936

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