Description: Lemma for ubth . Prove the reverse implication, using nmblolbi . (Contributed by Mario Carneiro, 11-Jan-2014) (New usage is discouraged.)
Ref | Expression | ||
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Hypotheses | ubth.1 | |
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ubth.2 | |
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ubthlem.3 | |
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ubthlem.4 | |
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ubthlem.5 | |
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ubthlem.6 | |
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ubthlem.7 | |
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Assertion | ubthlem3 | |