Mox nix to me if you cover for him.
It had been difficult to find space for disc brakes when axle-hung motors were used, but the length of motors was being reduced and one of the advantages of this might be the possibility of fitting disc brakes.
In this paper we define the notions of normal subcrossed module and quotient crossed module within groups with operations; and using the equivalence of crossed modules over groups with operations and internal groupoids we prove how normality and quotient concepts are related in these two categories.
'Oh, this fair is nothing but a chaos of noise and beggars,' I thought in disillusionment. 'I wonder if Western scientists, patiently enlarging the realms of knowledge for the practical good of mankind, are not more pleasing to God than these idlers who profess religion but concentrate on alms.'
