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  "body": "\n## Summary\n\nA measure is complete if every subset of a set of measure zero is measurable.\nThen such subsets automatically have measure zero.\nLebesgue measure on the Lebesgue measurable sets is complete, while its restriction to the Borel sets is not.\n\n## Explanations\n\n### L1 human\n\nIf a set has size zero, then any part of it should also have size zero.\nA complete measure makes sure that every such part is allowed to be measured at all.\nWithout completeness, a subset of a negligible set could be left out of the σ-algebra, which is awkward when one works with properties that hold almost everywhere.\nEvery measure can be completed by adding these subsets.\n",
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