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About LinkBacksProve that the subtraction operation for ordinal numbers coincides with the following operation defined by recursion:
α -* α=0
β+ -* α=(β-* α)+ for α ≤ β
γ-* α=sup{β-* α:β < γ} when γ is alimit.
Prove that the subtraction operation for ordinal numbers coincides with the following operation defined by recursion:
α -* α=0
β+ -* α=(β-* α)+ for α ≤ β
γ-* α=sup{β-* α:β < γ} when γ is alimit.
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