Kőnig's theorem #1720
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Kőnig's theorem #1720
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Clarified the conclusion about `leq-Cardinal` being antisymmetric and a partial order, referencing the Cantor–Schröder–Bernstein theorem and the law of excluded middle.
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Formalizes Kőnig's theorem: given two families of cardinals
AandBoverIsuch thatA i < B ifor alli, thenΣᵢAᵢ < ΠᵢBᵢ.Depends on #1604 and #1591