Description: Given a sequence E of sets, a sequence F of disjoint sets is built, such that the indexed union stays the same. As in the proof of Property 112C (d) of Fremlin1 p. 16. (Contributed by Glauco Siliprandi, 17-Aug-2020)
Ref | Expression | ||
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Hypotheses | iundjiun.nph | |
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iundjiun.z | |
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iundjiun.e | |
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iundjiun.f | |
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Assertion | iundjiun | |