Symbols Logic for iPhone

App overview

Symbols Logic is an iPhone app that teaches the basics of formal reasoning using natural deduction and common inference rules. It’s built for novices and for anyone wanting a quick refresher, combining short Studycards with hands-on practice to build confidence in logical thinking.

Key principles covered

The app introduces foundational techniques such as natural deduction and standard rules of inference. Examples and exercises include well-known forms like Modus Ponens, Modus Tollens, and Disjunctive Syllogism so learners gain a solid conceptual grounding.

Hands-on exercises

The interactive Activities are designed to reinforce learning through progressively challenging tasks:

• Translation — Convert everyday sentences into precise logical expressions to improve interpretation skills.
• Inference — Create complete, valid proofs from given premises to test construction of arguments.
• Justification — Provide the missing steps in an existing proof to practice reasoning and rule application.
• Validity — Repeatedly evaluate and practice with fresh arguments to internalize inference rules.

Who benefits

Students, hobbyists, and professionals who want to sharpen deductive reasoning will find Symbols Logic useful. Its mix of short study material and active problem-solving supports both initial learning and ongoing practice.

Suggested alternative

If you’d like a different option, consider Greenie — Save the Planet (free), a recommended alternative that may appeal if you prefer an app with a different focus or presentation style.