Tautologies & Equivalences: Proving De Morgan with a Truth Table
This lesson is part of the course
In this lesson
You prove De Morgan's law and the distributive law by checking all 8 rows of a three-variable truth table, and you count the rows where a popular wrong "law" fails.
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Lessons in this course
- Propositions & Truth Tables: AND, OR, NOT, XOR Locked
- Implication & Biconditional: IF–THEN Logic in Excel Locked
- Tautologies & Equivalences: Proving De Morgan with a Truth Table Locked
- Sets as 0/1 Membership Columns: Union, Intersection & Difference Locked
- Venn Diagrams from Data: Counting the 8 Regions of Three Sets Locked
- Logic Puzzles: Test Every Candidate Row Locked
- Quantifiers on Data: "For All" and "There Exists" with COUNTIF Locked
- Logic in Business Rules: Testing a Decision Table for Conflicts & Gaps Locked