They had a symbol for zero and understood its importance in mathematical calculations.
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A mathematician is a person whose primary area of study and research is the field of mathematics. People who apply mathematics to other field, but do not contribute directly to mathematical, are generally not considered mathematician.
He discovered a ultimately great art of Mathematics
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In mathematics, a field is a set on which addition, subtraction, multiplication, and division are defined and behave as the corresponding operations on rational and real numbers do. A field is thus a fundamental algebraic structure which is widely used in algebra, number theory, and many other areas of mathematics.
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