🧩

Introduction to Logic

Part 2: The Tools of Logic
6 Lessons

Use connectives, conditionals, truth tables and valid forms with confidence.

Free download: The Logic Cheat Sheet

A printable summary of key concepts, connectives, valid argument forms, formal and informal fallacies, and a five step method for any argument.

Download PDF
1

Logical Connectives: Not, And, Or

How the words not, and, and or combine simple statements into compound ones that can be tested for truth.

25 min
Lesson
Comprehension
Practice
Key Terms
2

Conditionals: If, Only If and Unless

How conditional statements work, what makes them true or false, and how to spot their hidden logical cousins.

25 min
Lesson
Comprehension
Practice
Key Terms
3

Truth Tables Made Simple

Learn how to build and read truth tables for the four main logical connectives, use them to test arguments for validity, and recognise tautologies and contradictions.

25 min
Lesson
Comprehension
Practice
Key Terms
4

Valid Argument Forms

Learn four classic argument patterns that guarantee a valid conclusion whenever their premises are true.

25 min
Lesson
Comprehension
Practice
Key Terms
5

Formal Fallacies

Learn the three most common formal fallacies, understand why they fool us, and use the valid forms as a reliable test.

25 min
Lesson
Comprehension
Practice
Key Terms
6

Categorical Logic: All, Some and No

How statements about all, some and no things fit together to form valid or invalid categorical arguments.

25 min
Lesson
Comprehension
Practice
Key Terms