The pure singlet asymptotic heavy flavor corrections to 3-loop order for the
deep-inelastic scattering structure function F2(x,Q2) and the corresponding
transition matrix element AQq(3),PS in the variable flavor number
scheme are computed. In Mellin-N space these inclusive quantities depend on
generalized harmonic sums. We also recalculate the complete 3-loop pure singlet
anomalous dimension for the first time. Numerical results for the Wilson
coefficients, the operator matrix element and the contribution to the structure
function F2(x,Q2) are presented.Comment: 85 pages Latex, 14 Figures, 2 style file