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  "body": "\n## Summary\n\nSet-builder notation describes a [[set|0SJ3RX9TXA]] by a property of its [[elements|0EZ758XE73]].\nFor a set $X$ and a [[predicate|0T3DPBG981]] $P(x)$ on $X$, the set $\\{x \\in X \\mid P(x)\\}$ has as elements exactly the $a \\in X$ such that $P(a)$ is true.\n\n## Remarks\n\nA colon is a common alternative to the bar: $\\{x \\in X : P(x)\\}$.\nExample: $\\{n \\in \\mathbb{Z} \\mid n \\text{ is even}\\}$ is the set of even integers.\nThe form $\\{f(x) \\mid x \\in X\\}$ denotes the set of the values $f(x)$. This is the [[image|0Q3F20XB0A]] of $X$ under $f$.\nWithout the bound $x \\in X$, the notation $\\{x \\mid P(x)\\}$ can lead to [[Russell's paradox|0HESMMSYEG]].\n\n## Explanations\n\n### L1 human\n\nInstead of a list of elements, you give a test.\n$\\{x \\in \\mathbb{R} \\mid x^2 = 4\\}$ means \"all real numbers whose square is $4$\".\nThis set is $\\{-2, 2\\}$.\n",
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      {
        "what": "an inventory row",
        "note": "the row of the inventory that the node accounts for",
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