7 lines
167 B
Text
7 lines
167 B
Text
example : x ≠ y → x ∉ [y] :=
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fun hne hin =>
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match hin with
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| .head _ _ => hne rfl
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example : x ≠ y → x ∉ [y] :=
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fun hne (.head _ _) => hne rfl
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