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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fl. 1530s
Mathematician who showed that not all numbers of the form 2n-1 for all primes n are themselves prime. Up to Regius's time, mathematicians had assumed that this was so, since 22-1=3, 23-1=7, 25-1=31, and so on. However, Regius showed that the result of 211-1 is not a prime number: its result, 2047, is equal to 23 multiplied by 89.