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