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  "body": "\n## Definition\n\nLet $A$ and $B$ be [[sets|0SJ3RX9TXA]].\nThe set difference of $A$ and $B$ is the set\n$$A \\setminus B = \\{x \\in A \\mid x \\notin B\\}.$$\nIt is also called the relative complement of $B$ in $A$.\n\n## Remarks\n\nAnother notation is $A - B$.\nExample: $\\{1, 2, 3\\} \\setminus \\{2, 4\\} = \\{1, 3\\}$.\nThe set $B$ need not be a subset of $A$.\nIn general, $A \\setminus B \\neq B \\setminus A$.\n\n## Explanations\n\n### L1 human\n\nTo compute $A \\setminus B$, start with $A$ and remove each element that is also in $B$.\nElements of $B$ that are not in $A$ do not matter.\n",
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