Image of a formal proof in fitch format

Accessible Open Textbooks in Math-Heavy Disciplines

The challenge The authoring platform of choice in many math-heavy disciplines is LaTeX. It produces typeset documents of excellent quality and handles formulas and mathematical diagrams extremely well. Practically every researcher or instructor in mathematics, physics, and computer science is adept at using it, and it has a wide user base outside these core disciplines … Continue reading Accessible Open Textbooks in Math-Heavy Disciplines

MUltseq 2.0

MUltseq is a sequent theorem prover for arbitrary finite-valued logics. It was developed over 20 years ago by Àngel Gil and Gernot Salzer. Version 2.0 was presented today at TACL 2024 in Barcelona. I also updated MUltlog to v1.7, which includes a script to generate sequent calculus rules for use with MUltseq.

New details on why Tarski was reluctant to leave Poland before WWII

Paolo Mancosu has a new paper out in the Journal of Humanistic Mathematics: This article makes available some early letters chronicling the relationship between the biologist Joseph H. Woodger and the logician Alfred Tarski. Using twenty-five unpublished letters from Tarski to Woodger preserved in the Woodger Papers at University College, London, I reconstruct their relationship … Continue reading New details on why Tarski was reluctant to leave Poland before WWII

MUltlog 1.13 released

MUltlog is a Prolog program that converts a specification of a finite-valued logic (propositional or first-order) into optimal inference rules for a number of related analytic proof systems: many-sided sequent calculus, signed tableaux, many-sided natural deduction, and clause translation calculi for signed resolution. The specification of the logic can be produced by a simple TCL/TK … Continue reading MUltlog 1.13 released

Adding online exercises with automated grading to any logic course with Carnap

A couple of years ago I posted a roundup of interactive logic courseware with an automatic grading component. The favorite commercial solution is Barwise & Etchemendy's Language, Proof, and Logic textbook that comes with software for doing truth tables, natural deduction proofs, and semantics for propositional and first-order logic, which also automatically grades student's solutions. … Continue reading Adding online exercises with automated grading to any logic course with Carnap