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Interchangeable variables and values

Interchangeable variables and values

Interchangeable variables and values

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30 proper colourings<br />

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•<br />

An example<br />

But only 3 if we break symmetry<br />

X1,..X5 is 1,1,2,2,2, or 1,1,2,2,3<br />

or 1,2,3,3,3<br />

Some of the colourings eliminated<br />

by ordering signatures<br />

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2,1,3,3,3 <strong>and</strong> 1,1,3,3,3 <strong>and</strong><br />

1,1,2,3,3<br />

X1<br />

X2<br />

X3<br />

X4<br />

X5

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