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  "body": "\n## Summary\n\nAn s-finite measure is a measure that is a countable sum of finite measures.\nEvery σ-finite measure is s-finite, but not conversely.\nThe class of s-finite measures is used in probability theory, for example for kernels and point processes.\n\n## Explanations\n\n### L1 human\n\nAn s-finite measure is built by stacking countably many finite measures on top of each other and adding them.\nEach layer has finite total size, but the sum may be infinite everywhere it is not zero.\nInfinitely many copies of length on the interval $[0, 1]$, added together, give a measure that is s-finite.\nEvery subset of $[0, 1]$ of positive length then has infinite size, and this measure is not σ-finite.\n",
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