Theorems · Theorem · combinatorics
catalan_two
catalan 2 = 2
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- Foundations
- Depth 83 from the axioms · uses propext, Classical.choice, Quot.sound
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- add_zeroproof · cited by 2,707
- catalanstatement · cited by 13
- catalan_eq_centralBinom_divproof · cited by 3
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