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 Mathematics Mathematics (Gr.: μαθηματικός (mathematikós)) is often defined as the study of quantity, structure, change, and space. More informally, some might call it the study of "figures and numbers". In the formalist view, it is the investigation of axiomatically defined abstract structures using logic and mathematical notation. In the realist view, it is the investigation of objects or concepts that exist independently of our reasoning about them. Other views are described in the philosophy of mathematics article. Due to its applicability in practically every scientific discipline, mathematics has been called "the language of science" and "the language of the universe". If you are interested in learning mathematics, there are several books on the subject at http://www.wikibooks.org, at both the grade school and college level.
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 In mathematics, the Pythagorean theorem or Pythagoras' theorem, is a relation in Euclidean geometry between the three sides of a right angled triangle. The theorem is named after and commonly attributed to the sixth century BC Greek philosopher and mathematician Pythagoras, although the facts of the theorem were known by Indian, Greek, Chinese and Babylonia mathematicians well before he lived. The first known proof of the Pythagorean theorem can be found in Euclid's Elements.