As part of the Honduran Symbolic Logic requirements, students need to understand several Rules of Inference and Logical Fallacies. They also tie in very well to the concept of proofs and truth tables in chapter 2 of the McGraw-Hill Geometry textbook.
For the "Create Rules of Inference and Logical Fallacies Examples" Worksheet, the arguments or fallacies are listed in symbolic form. Students (1) create sentences that fit each group of symbols, (2) determine the conclusion or write "no conclusion" and (3) name the rule/fallacy that was used.
Included Rules of Inference and Logical Fallacies:
1. Modus Ponens (Law of Detachment)
2. Affirming the Consequent (Converse Error)
3. Denying the Antecedent (Inverse Error)
4. Modus Tollens (Law of Contrapositive)
5. Double Negation
6. Syllogism (Transitive Property or Chain Rule)
7. Disjunctive Syllogism
In my classroom, it helped some students understand the connection between the symbols in their notes and actual arguments as written in notes examples, quizzes and tests.
Prior knowledge of conjunction, disjunction, negation, and conditional statements in symbolic form required.