16 lines
564 B
Text
16 lines
564 B
Text
structure [class] semigroup (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 [class] has_two_muls (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 [class] another_two_muls (A : Type) extends has_mul A renaming mul→mul1,
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has_mul A renaming mul→mul2
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