Geometry — Circle, Rectangle, Polygon, Arrow, Arc, Star, Brace, and more
Lean is the result of over twelve years of continuous development. We designed and built every layer from scratch: the trusted kernel, the compiler, the language server, the IDE, the proof automation. The team is 20 people. The community independently chose Lean: mathematicians, AI researchers, and enterprise engineers, all building on the same platform.
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Trump warns 'there will likely be more' US deaths in Iran conflict