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  "body": "\n## Example\n\nLet $m$ and $n$ be natural numbers.\nThe complete bipartite graph $K_{m,n}$ is the [[graph|0JD5C82QMB]] whose vertex set is a disjoint union $A \\sqcup B$ with $|A| = m$ and $|B| = n$.\nTwo vertices are adjacent if and only if one is in $A$ and the other is in $B$.\n\n## Remarks\n\n$K_{m,n}$ has $m + n$ vertices and $mn$ edges.\nIt is [[bipartite|07DVHJ8N0A]] with parts $A$ and $B$. For $m, n \\ge 1$ its [[chromatic number|0FJBBCXYPS]] is $2$.\n$K_{1,n}$ is a star. [[$K_{3,3}$ is not planar|030A3FHN14]].\n\n## Explanations\n\n### L1 human\n\nSplit the vertices into two groups and join every vertex of one group to every vertex of the other group.\nThere are no edges inside a group.\n",
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