23 lines
396 B
Text
23 lines
396 B
Text
section
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variable {A : Type}
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definition f (a b : A) := a
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infixl ` ◀ `:65 := f
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variables a b : A
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#check a ◀ b
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end
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inductive List (T : Type) : Type
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| nil {} : List
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| cons : T → List → List
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namespace List
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section
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variable {T : Type}
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notation `[` l:(foldr `,` (h t, cons h t) nil) `]` := l
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#check [(10:num), 20, 30]
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end
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end List
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open List
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#check [(10:num), 20, 40]
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#check (10:num) ◀ 20
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