5 lines
210 B
Text
5 lines
210 B
Text
open nat
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definition lt_of_succ : ∀ {a b : nat}, succ a < b → a < b
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| lt_of_succ (lt.base (succ a)) := nat.lt_trans (lt.base a) (lt.base (succ a))
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| lt_of_succ (lt.step h) := lt.step (lt_of_succ h)
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