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  "body": "\n## Summary\n\nIn mathematics, the **Turán number** $T(n,k,r)$ for $r$-uniform hypergraphs of order $n$ is the smallest number of $r$-edges such that every [[induced subgraph|0EREPBVG2G]] on $k$ vertices contains an edge. This number was determined for $r = 2$ by (Turán 1941), and the problem for general $r$ was introduced in (Turán 1961). The paper (Sidorenko 1995) gives a survey of Turán numbers.\n",
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        "what": "edge defines in",
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        "what": "edge instance_of in",
        "note": "at least two examples",
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