Description: If an extended real number can be approximated from below by members of a set, then it is less than or equal to the supremum of the set. (Contributed by Glauco Siliprandi, 17-Aug-2020)
Ref | Expression | ||
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Hypotheses | supxrge.xph | |
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supxrge.a | |
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supxrge.b | |
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supxrge.y | |
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Assertion | supxrge | |