[Review of] Paul A. Scanlon, ed. Stories from Central and Southern Africa

Any work in the prestigious paperback African Writers Series commands immediate attention and respect. As policy makers and policy breakers wrestle about the South African question -- newly discovering the horrors of an inequality that has existed for more than 300 years -- it is refreshing to look at this collection of twenty-two short narratives. They provide a proper cultural baseline for the current struggle. Like it or not, what lies underneath the political turmoil are cultural values

[Review of] Mark Naison. Communists in Harlem During the Depression

The Communist Party and its relationship to blacks in the United States is a difficult subject to fully research. Necessary critical information must lie in still secret vaults in Washington and in Moscow. Naison\u27s former dissertation is a praise-worthy effort to unravel fact from fantasy as it applied to Black Harlem and the Party

Task scheduling for a real time multiprocessor

Algorithm for scheduling real time tasks in multiprocessing syste

On the bounded generation of arithmetic SL2{\rm SL}_2

Let $K$ be a number field and ${\mathcal O}$ be the ring of $S$-integers in $K$. Morgan, Rapinchuck, and Sury have proved that if the group of units ${\mathcal O}^{\times}$ is infinite, then every matrix in ${\rm SL}_2({\mathcal O})$ is a product of at most $9$ elementary matrices. We prove that under the additional hypothesis that $K$ has at least one real embedding or $S$ contains a finite place we can get a product of at most $8$ elementary matrices. If we assume a suitable Generalized Riemann Hypothesis, then every matrix in ${\rm SL}_2({\mathcal O})$ is the product of at most $5$ elementary matrices if $K$ has at least one real embedding, the product of at most $6$ elementary matrices if $S$ contains a finite place, and the product of at most $7$ elementary matrices in general