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Internet is an indispensable tool that african countries may take advantage for ( 1 ) a regional integration , ( 2 ) an involvment into international activities and ( 3 ) a complete control on their development . ( 3 ) A problem of Deligne and Simpson concerning the existence of matrices in given conjugacy classes whose product is the identity . HS 302 Social Change and Advocacy in Human Services ( 3 ) A course designed to familiarize students with the social issues in human services . This technology will tend to be most useful in the presence of ( 1 ) a large product assortment , ( 2 ) multi-item purchases , and ( 3 ) a substantial amount of preference heterogeneity among shoppers .