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  "body": "\n## Summary\n\nList coloring is a form of [[graph colouring|0NCPXH194Y]] in which each vertex must take its colour from its own list of allowed colours.\nA graph is $k$-choosable if it can be coloured from any lists of size $k$, and the least such $k$ is its choice number.\nThe choice number is at least the [[chromatic number|0VHJRXNAAS]], and it can be much larger.\n\n## Explanations\n\n### L1 human\n\nImagine scheduling exams, where two exams that share a student need different time slots.\nIn ordinary colouring every exam may use any slot.\nIn list coloring each exam has its own list of possible slots, and you must still find a clash-free choice.\nFor example, the complete bipartite graph $K_{3,3}$ can be coloured with $2$ colours, but there are lists of size $2$ from which it cannot be coloured.\n",
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