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feat(set_theory/ordinal/basic): tweak theorems on order type of empty…
… relation (#14650) We move the theorems on the order type of an empty relation much earlier, and golf them. We also remove other redundant theorems. `zero_eq_type_empty` is made redundant by `type_eq_zero_of_empty`, while `zero_eq_lift_type_empty` is made redundant by the former lemma and `lift_zero`.
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