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feat(SetTheory/Ordinal): definition of addition and multiplication - #43588

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plp127 wants to merge 2 commits into
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plp127:aliu/ordinal-sum-prod
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feat(SetTheory/Ordinal): definition of addition and multiplication#43588
plp127 wants to merge 2 commits into
leanprover-community:masterfrom
plp127:aliu/ordinal-sum-prod