The following sections of this BookRags Literature Study Guide is offprint from Gale's For Students Series: Presenting Analysis, Context, and Criticism on Commonly Studied Works: Introduction, Author Biography, Plot Summary, Characters, Themes, Style, Historical Context, Critical Overview, Criticism and Critical Essays, Media Adaptations, Topics for Further Study, Compare & Contrast, What Do I Read Next?, For Further Study, and Sources.
(c)1998-2002; (c)2002 by Gale. Gale is an imprint of The Gale Group, Inc., a division of Thomson Learning, Inc. Gale and Design and Thomson Learning are trademarks used herein under license.
The following sections, if they exist, are offprint from Beacham's Encyclopedia of Popular Fiction: "Social Concerns", "Thematic Overview", "Techniques", "Literary Precedents", "Key Questions", "Related Titles", "Adaptations", "Related Web Sites". (c)1994-2005, by Walton Beacham.
The following sections, if they exist, are offprint from Beacham's Guide to Literature for Young Adults: "About the Author", "Overview", "Setting", "Literary Qualities", "Social Sensitivity", "Topics for Discussion", "Ideas for Reports and Papers". (c)1994-2005, by Walton Beacham.
All other sections in this Literature Study Guide are owned and copyrighted by BookRags, Inc.
945?-1020?
Persian mathematician and astrologer who considered a number of challenging geometric problems. Notable among his works is Book of the Measurement of Spheres by Spheres, in which he presented 12 theorems involving a large sphere containing between one and three smaller spheres. Some historians maintain than in this work al-Sijzi approached the idea of a four-dimensional sphere, though it is likely that this is the result of his own misunderstanding of the factors he was considering. He did, however, approach the topic suggested in the title of another work, Treatise on How to Imagine the Two Lines Which Approach but Do Not Meet When They Are Produced Indefinitely.