Mathematics during the Golden Age of Islam, especially during the 9th and 10th centuries, was built on Greek mathematics (Euclid, Archimedes, Apollonius) and Indian mathematics (Aryabhata, Brahmagupta). Important progress was made, such as the full development of the decimal place-value system to include decimal fractions, the first systematised study of algebra (named for The Compendious Book on Calculation by Completion and Balancing by scholar Al-Khwarizmi), and advances in geometry and trigonometry.[1]
Arabic works also played an important role in the transmission of mathematics to Europe during the 10th to 12th centuries.[2]
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In the United States, where the Depression was generally worst, industrial production between 1929 and 1933 fell by nearly 47 percent, gross domestic product (GDP) declined by 30 percent, and unemployment reached more than 20 percent.
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By the late 17th century, Virginia's and Maryland's economic and social structure rested on the great planters and the yeoman farmers. The planters of the tidewater region, supported by slave labor, held most of the political power and the best land.
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