Mathematics is the study of topics such as quantity, structure, space, and change. The word originates from the Greek word meaning learning or knowledge. While the earliest uses of mathematics were in trading and construction by ancient Babylonians, Egyptians and Greeks, it has since developed into a wide-ranging discipline studied and advanced by famous mathematicians from Pythagoras to Euclid to al-Khwārizmī. Views of mathematics emphasize it as both the language of the universe expressed through geometric shapes and figures, as well as a subject that can only be truly learned through active practice and problem solving.