Language Proof and Logic is available as a physical book with the software included on CD and as a downloadable package of software plus the book in PDF format.
It is designed to be used b.
An on-line grading services instantly grades solutions to hundred of computer exercises.
The textbook/software package covers first-order Language in a method appropriate for first and Second courses in logic.
The all-electronic version is available from OpenProof at ggweb.stanford.edu.
Language Proof and Logic is available as a physical book with the software included on CD and as a downloadable package of software plus the book in PDF format