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My Gateway to Logic displays truth tables, expression trees, alpha graphs, normal forms and so on, both in a server side and a client side version. It proves theorems of propositional and predicate logic and contains a proof checker and a Lemmon-style proof builder as well as a Fitch-style proof builder and even a proof builder of the Alpha Part of Peirce's Existential Graphs. In 1996, Jars has rated the Gateway "Top 25%", and Gamelan considered it "cool".

Part of the Gateway requires a Java-capable browser, part works with virtually any browser, even with text-based programs like Lynx.

There are several lists of logical web resources. The following are among the best:

- The resource list at Texas A & M University.
- Dr. Martindale's Reference Desk is an extremely comprehensive (probably complete) list of online software (including logic-related programs).
- "What are the best philosophy resources?" at encyclopaedia.com
- Spanish Pagina sobre filosofia by Francisco Conde
- Episteme Links, another compilation of philosophy-related resources.
- The Logic & Set Theory chapter of the Math Archives at the University of Tennessee, Knoxville
- A list of very thoroughly selected logical resources (University of Düsseldorf)
- Martin Flashman's Logic and Set Theory Web Surfing Page
- Mathematical Logic around the world
- Logical resources from Finland
- Mariusz Grygianiec's und Piotr Lajeczko's Philosophia Analytica in Polonia, a collection of information on Polish logic and analytical philosophy
- Peter Suber's Logic topics
- The chapter on philosophy in Yale University's Internet library contains several entries on logic.
- The new Mining Co. index contains a growing collection of logical links.
- Jose Emilio Labra Gayo's very useful page Logic for Computer Science

- Bertrand Russell, On Denoting
- My introductory textbook Einführung in die Logik (German)
- An English introductory text by Garth Kemerling

- The Logic Daemon by Colin Allen is a very good proof checker.
- Part of my Gateway to Logic (the server side) works online.
- Metamath Solitaire is a Java applet that allows to interactively construct proofs in predicate logic and set theory; it uses an axiomatic approach.
- Interactively practice truth tables (California State University)
- A theorem prover
for
*linear logic*(by Naoyuki Tamura) - At TU Vienna there is an interesting Default Logic Java applet.
- John Kennedy's Propositional Logic Program displays truth tables and expression trees, converts propositions to Polish notation and optimizes using the algorithm of Karnaugh/Veitch. This text-mode MS-DOS program works well with Windows and with any DOS emulator (e.g. Linux Dosemu).
- Otter is one of the most well-known theorem provers.
- Prover9 is intended to be Otter's successor.
- Sadly, I had to replace the link to Peter Gibbins' excellent proof checkers for Lemmon's calculus and for quantum logic by a link to an obituary.

2012-03-31 01:19:44

christian.gottschall@posteo.de