22 lines
641 B
Text
22 lines
641 B
Text
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import logic
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structure has_mul [class] (A : Type) :=
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(mul : A → A → A)
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structure semigroup [class] (A : Type) extends has_mul A :=
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(assoc : ∀ a b c, mul (mul a b) c = mul a (mul b c))
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print prefix semigroup
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print "======================="
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structure has_two_muls [class] (A : Type) extends has_mul A renaming mul→mul1,
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private has_mul A renaming mul→mul2
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print prefix has_two_muls
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print "======================="
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structure another_two_muls [class] (A : Type) extends has_mul A renaming mul→mul1,
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has_mul A renaming mul→mul2
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