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Mathematics is commonly defined as the study of patterns of structure, change, and space; more informally, one might say it is the study of "figures and numbers". Although mathematics itself is not usually considered a natural science, the specific structures that are investigated by mathematicians often have their origin in the natural sciences, most commonly in physics. The major disciplines within mathematics arose out of the need to do calculations in commerce, to measure land and to predict astronomical events. It includes subjects like includes arithmetic, algebra, geometry, trigonometry, and calculus.