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[Merged by Bors] - feat(SetTheory/Cardinal): formulas for sum (fun n : ℕ ↦ x ^ n) #4848

[Merged by Bors] - feat(SetTheory/Cardinal): formulas for sum (fun n : ℕ ↦ x ^ n)

[Merged by Bors] - feat(SetTheory/Cardinal): formulas for sum (fun n : ℕ ↦ x ^ n) #4848