9 lines
192 B
Text
9 lines
192 B
Text
import data.nat
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open algebra
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theorem test {A : Type} [s : comm_ring A] (a b c : A) : a + b + c = a + c + b :=
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begin
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rewrite add.assoc [b + _]add.comm -add.assoc,
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end
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print definition test
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