Nuclear waste disposal in space

Work on nuclear waste disposal in space conducted by the George C. Marshall Space Flight Center, National Aeronautics and Space Administration, and contractors are reported. From the aggregate studies, it is concluded that space disposal of nuclear waste is technically feasible

Equivalence of block sequences in Schreier spaces and their duals

We prove that any normalized block sequence in a Schreier space $X_\xi$, of arbitrary order $\xi<\omega_1$, admits a subsequence equivalent to a subsequence of the canonical basis of some Schreier space. The analogous result is proved for dual spaces to Schreier spaces. Basing on these results, we examine the structure of strictly singular operators on Schreier spaces and show that there are $2^\mathfrak{c}$ many closed operator ideals on a Schreier space of any order, its dual and bidual space.Comment: Corrected citatio