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doc(doc/lean/calc.md): link to Nat.lean

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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
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Leonardo de Moura 2014-01-03 11:57:41 -08:00
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doc/lean/calc.md
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@ -80,3 +80,5 @@ The Lean `let` construct can also be used to build calculational-like proofs.
s3 : P a b := Subst s2 (Axf b)
in s3.
```
Finally, the [Nat (natural number) builtin library](../../src/builtin/Nat.lean) makes extensive use of calculational proofs.