Notes for AKT-090910-1/0:26:16: Difference between revisions
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Invariance of tricolourability under R1. Side benefit: explanation of 'local' diagram notation. |
Invariance of tricolourability under R1. There are 2 directions to check, i.e. (left) 3-colourable <math>\Rightarrow</math> (right) 3-colourable, and (left) colourable <math>\Leftarrow</math> (right) colourable. Side benefit: explanation of 'local' diagram notation. |
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Latest revision as of 16:39, 22 September 2009
Invariance of tricolourability under R1. There are 2 directions to check, i.e. (left) 3-colourable (right) 3-colourable, and (left) colourable (right) colourable. Side benefit: explanation of 'local' diagram notation.
