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Try doing some basic maths questions in the Lean Theorem Prover. Functions, real numbers, equivalence relations and groups. Click on README.md and then on "Open in CoCalc with one click".

Project: Xena
Views: 18536
License: APACHE
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import topology.category.Top.basic
import topology.category.Top.limits
import topology.category.Top.epi_mono
import topology.category.Top.open_nhds