Symbols vs Re

Learn logic with Symbols, the app that teaches natural deduction and the rules of inference in an intuitive, accessible way. Our unique Studycards feature visual pictographs and interactive, step-by-step exercises that allow you to grasp each rule easily and quickly. Then, challenge yourself with activities specifically designed to practice those rules, building your skills progressively, and cementing them in your memory with every level completed. Why Symbols? Comprehensive Studycards: Learn essential rules like Modus Ponens, Modus Tollens, Disjunctive Syllogism, and many more through clear explanations and examples. Perfect for students and anyone looking to understand formal logic. Engaging Activities for Skill Mastery: Validity: Sharpen your critical thinking by evaluating pre-solved arguments. This unique activity provides the benefits of repetition without the tedium, helping you apply, recognize, and grow familiar with the rules of inference. Justification: Challenge your understanding with puzzle-like scenarios where you deduce missing argument steps. This deepens your comprehension and refines your application of logical rules within complex arguments. Inference: By this stage, the training wheels are off, and the student has to draw on everything they've learned so far. Their task is to mentally build a valid argument from what’s provided—or to recognize that no valid argument can be formed. What would normally be worked out slowly on paper is now done at the speed of thought. Translation: Translation helps students practice turning statements with indicator words and phrases into logical form. These indicator words, commonly found in logic books and courses, give students a sense of how to translate everyday language into formal logic. Translation breaks this process into levels, allowing students to track their progress and earn new scores as they build proficiency. Download Symbols for free and begin your journey into formal logic. Your free access includes the first level of every activity and the Modus Ponens study card, a must-have for getting started. For more advanced content and features, simply use our in-app purchases to continue building your logic skills. Start your journey of mastering the rules of inference now!

Re:Mind helps you make better decisions by putting powerful mental models at your fingertips. Discover proven frameworks from the world's best thinkers to solve problems, enhance creativity, and see the world in new ways. Key features: • Build your mental toolkit with our carefully curated collection of mental models • Learn when and how to apply each model through practical examples • Save your favorite models for quick reference • Get a fresh perspective with our daily widget that surfaces new mental models • Search across disciplines including psychology, economics, science, and philosophy • Customize your experience with dark and light modes Whether you're a student, professional, or lifelong learner, Re:Mind helps you develop clearer thinking and better decision-making skills. Each mental model includes detailed explanations of why, when, and how to use it, along with common pitfalls to avoid. Start expanding your mental toolkit today and join others who are upgrading their thinking one model at a time.