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.
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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.
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1135?-1213
Persian mathematician and astronomer who helped lay the foundations for algebraic geometry. In his Treatise on Equations, al-Tusi examined a number of equations, including cubics, and appears to have applied an early version of what would much later come to be known as the Ruffini-Horner method. In fact, this method had been developed earlier by Arab mathematicians, but al-Tusi's writing contains the first extant example of it.