Interactive Learning Platform
Learn Lean 4 Theorem Proving
Master mathematical proof writing with an interactive editor and real-time compilation. Start proving theorems in your browser right now!
Structured Learning
Problem Sets
Follow a guided path with curated problem sets covering Lean fundamentals, functions, logic, and more. Perfect for systematic learning!
What's included:
- • 15+ problems from basics to advanced
- • Step-by-step hints and explanations
- • Instant feedback with Lean compiler
- • Track your learning progress
Free Exploration
Interactive Editor
Jump straight into the interactive editor to experiment freely. Load examples, write proofs, and get immediate feedback.
What you can do:
- • Write and compile Lean code instantly
- • Load pre-built examples
- • Experiment with theorems
- • Learn at your own pace
Lean 4 Proof Assistant
Write and verify mathematical proofs interactively
Code Editor
Output
Output will appear here after compilation...
Examples
Click an example to load it into the editor
💡 Tips for Learning Lean
- • Use
rfl(reflexivity) to prove things that are definitionally equal - • The
#checkcommand shows the type of an expression - • The
#evalcommand evaluates an expression and shows the result - • Start with simple examples and gradually work up to more complex proofs
- • Read error messages carefully - they often tell you exactly what's wrong
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Understanding the difference between building your Cubicube and accessing it
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Learning Resources
Expand your Lean knowledge with these helpful resources
📚 Official Docs
Read the official Lean 4 documentation and learn from comprehensive guides.
Visit Lean Docs →🎓 Theorem Proving
Learn theorem proving in Lean 4 with interactive tutorials and exercises.
Start Learning →Need help? Press ⌘K or Ctrl+K for quick actions