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Weak colourings of Kirkman triple systems
A $\delta$-colouring of the point set of a block design is said to be {\em weak} if no block is monochromatic. The {\em weak chromatic number} $\chi(S)$ of a block design $S$ is the smallest integer $\delta$ such that $S$ has a weak $\delta$-colouring. It has previously been shown that …