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Abel, Niels Henrik, 1802-1829

Abel’s life was short and penurious, but successful, and he received recognition in his lifetime. His father—a minister of the church in Norway, but

Acute angle

Angle between 0° and 90°; that is, an amount of turn that is less than a quarter of a circle.


To get started, we should begin by reviewing the principles of addition. The symbol for addition is +, and the numbers to be added are called addends

Open Airy, George Biddell, 1801-1892
Airy, George Biddell, 1801-1892

English astronomer. He installed a transit telescope at the Royal Observatory at Greenwich, England, and accurately measured Greenwich Mean Time by

Open Alembert, Jean Le Rond d', 1717-1783
Alembert, Jean Le Rond d', 1717-1783

French mathematician, encyclopedist, and theoretical physicist. In association with Denis Diderot , he helped plan the great Encyclopédie , for which


Branch of mathematics in which the general properties of numbers are studied by using symbols, usually letters, to represent variables and unknown


Book compiled by the Egyptian astronomer Ptolemy during the 2nd century, which included the idea of an Earth-centred universe; it was translated into

Open Ampère, André-Marie, 1775-1836
Ampère, André-Marie, 1775-1836

Place : France Subject : biography, physics French physicist, mathematician, chemist, and philosopher who founded the science of electromagnetics


In mathematics, the amount of turn or rotation; it may be defined by a pair of rays (half-lines) that share a common endpoint ( vertex ) but do not

Open Ansoff, H. Igor
Ansoff, H. Igor

H. Igor Ansoff was born in Vladivostock, Russia on 12 December 1918 and immigrated to the United States with his parents in 1935. He pursued courses