

Sample sentences AND operator IF/THEN operator NOT operator OR operator XOR operator Chain Rule Conjunctive Addition Contrapositive DeMorgan's Law Disjunctive Addition Disjunctive Inference Disjunctive Infer. (XOR) Double Negation Modus Ponens Modus Tollens Mutual Exclusion Simplification 2step 3step 4step 5step or more Bad Argument 
LOGIC This section of the site will help you get acquainted with formal logic. There are three main categories shown in light blue on the left navigation bar: Logical Operators These are the major building blocks of logic. The knowledge of the five operators and their truth tables is essential for understanding most logic problems and their solutions. There are links to the rules of logic pertinent to a specific operator. Rules of Logic Each logical operator has a set of rules associated with it. This category explores all the logic rules you will need to apply in order to solve validity proof problems. For each rule, there are links to relevant problems. Validity Proofs This section contains actual validity proof problems involving Logical Operators and Rules of Logic, and solutions with full explanations.
