Description: Two structures with the same base, hom-sets and composition operation have the same identity function. (Contributed by Mario Carneiro, 17-Jan-2017)
Ref | Expression | ||
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Hypotheses | catpropd.1 | |
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catpropd.2 | |
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catpropd.3 | |
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catpropd.4 | |
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Assertion | cidpropd | |