10 lines
269 B
Text
10 lines
269 B
Text
open nat tactic
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constant zeroadd (a : nat) : 0 + a = a
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meta definition xrewrite (th_name : name) : tactic unit :=
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do th ← mk_const th_name,
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rewrite_target th,
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try reflexivity
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example (a : nat) : (0 + a) + (0 + a) + (0 + a) = a + a + a :=
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by xrewrite `zeroadd
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