Definition: Formal Logic — Psychometric Glossary
Formal logic is the study of valid reasoning based on the structure of propositions, regardless of their content. An essential skill for the psychometric test.
- Definition and fundamental principles
- Logical connectors and truth tables
- Formal logic exercises for the test
- Strategies for evaluating reasoning validity
What is formal logic?
Formal logic is a branch of logic that studies the validity of reasoning by focusing solely on its structure, regardless of the content of the propositions. It uses symbols and precise rules to determine whether a conclusion necessarily follows from its premises.
The fundamental logical connectors are: conjunction (AND), disjunction (OR), negation (NOT), implication (IF...THEN), and equivalence (IF AND ONLY IF). These connectors allow building and analyzing complex reasoning.
Formal logic in the psychometric test
The logic section of the psychometric test evaluates your ability to reason formally. Questions present premises and ask you to determine which conclusions follow, or what premise is missing to validate a conclusion.
The key is to detach from the content and focus on the structure. A reasoning of the type 'If A then B. A is true. Therefore B is true' is valid regardless of the content of A and B.
Frequently asked questions
What logic rules should I know?
The essentials are: modus ponens (if A then B, A, therefore B), modus tollens (if A then B, not B, therefore not A), hypothetical syllogism, and De Morgan's laws. These rules cover the majority of test questions.
How to distinguish formal and informal logic?
Formal logic analyzes argument structure with symbols and strict rules. Informal logic evaluates arguments in natural language, taking into account context, biases, and fallacies.
Is formal logic difficult to learn?
The basics are accessible with practice. Start by understanding logical connectors and basic inference rules. Hiku's progressive exercises will guide you from beginner to advanced level.
Ready to get started?
Practice for free and prepare your psychometric test with Hiku.