The 2-modular Decomposition Matrices of the Non-principal Blocks of Maximal Defect of the Triple Cover of the Sporadic Simple McLaughlin Group

The calculation of the modular character tables of 3.McL is completed by the determination of the 2-modular decomposition numbers of the faithful irreducible ordinary characters of 3.McL. The results are obtained by using the computer algebra systems MOC, Meat-Axe and GAP, and by applying condensation methods.