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Prove ssdomfi and domtrfi #4401

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Prove ssdomfi and domtrfi #4401

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BTernaryTau
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I think this will be the last PR before I start tackling the Pigeonhole Principle.

ssdomfi

A finite set dominates its subsets, proved without using the Axiom of Power Sets (unlike ~ ssdomg ).

domtrfi

Transitivity of dominance relation for finite sets, proved without using the Axiom of Power Sets (unlike ~ domtr ).

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@avekens avekens avekens approved these changes

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@BTernaryTau @avekens