Description: If the outer measure of a countable union is not +oo , then it can be arbitrarily approximated by finite sums of outer measures. (Contributed by Glauco Siliprandi, 17-Aug-2020)
Ref | Expression | ||
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Hypotheses | omeiunltfirp.o | |
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omeiunltfirp.x | |
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omeiunltfirp.z | |
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omeiunltfirp.e | |
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omeiunltfirp.re | |
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omeiunltfirp.y | |
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Assertion | omeiunltfirp | |