number of k-colourings of the edge set of G with no monochromatic matching of size ℓ.
Consider the function ck, ℓ: given by ck, ℓ (n)= max {ck, ℓ (G):| V (G)|= n}, the maximum of ck,
ℓ (G) over all graphs G on n vertices. In this paper, we determine ck, ℓ (n) and the
corresponding extremal graphs for all large n and all fixed values of k and ℓ.