Metamath Proof Explorer
Description: The complement of an element of a sigma-algebra is in the sigma-algebra.
(Contributed by Glauco Siliprandi, 26-Jun-2021)
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Ref |
Expression |
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Hypotheses |
saldifcld.1 |
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saldifcld.2 |
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Assertion |
saldifcld |
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Proof
Step |
Hyp |
Ref |
Expression |
1 |
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saldifcld.1 |
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2 |
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saldifcld.2 |
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3 |
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saldifcl |
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4 |
1 2 3
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syl2anc |
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