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In particular, chapters 1, 8, and 9 have been greatly enhanced without disturbing the book's clear and gradual pedagogical approach.
Chapter 1 now uses a simpler and better definition of "deductive validity," which enhances the rest of the book (especially chapters 1 and 8-10, and their new components).
Chapter 8 now has:
Simpler definitions of "simple statement" and "compound statement"
More and more detailed examples of the Complete Truth-Table Method.
Chapter 9 now has
A detailed, step-by-step account of the Shorter Truth-Table Method (with detailed step-by-step examples for conclusions of different types)
A more complete and detailed account of Indirect Proof
A detailed justification for Indirect Proof treating each of the three distinct ways in which an argument can be valid
A new section on Conditional Proof, which complements the 19 Rules of Inference and Indirect Proof
Explications of proofs of tautologies using both Indirect Proof and Conditional Proof
A new section at the end of the chapter explaining the important difference between sound and demonstrative arguments.
The Appendices now include:
A new appendix on making the Shorter Truth-Table Technique (STTT) more efficient by selecting the most efficient sequence of STTT steps
A new appendix on Step 1 calculations for multiple-line shorter truth tables
A new appendix on unforced truth-value assignments, invalid arguments, and Maxims III-V.
In addition, a Companion Website offers
A Proof Checker
Complete Truth Table Exercises
Shorter Truth-Table Exercises
A Truth-Table Video
Venn Diagram Testing of Syllogisms
Hundreds of True/False and Multiple Choice Questions
An Instructor's Manual
A Solutions Manual