High Quality Content by WIKIPEDIA articles! The concept of negligibility can find its trace back to sound models of analysis. Though the concepts of "continuity" and "infinitesimal" became important in mathematics during Newton and Leibniz's time, they were not well-defined until late 1810s. The first reasonably rigorous definition of continuity in mathematical analysis was due to Bernard Bolzano, who wrote in 1817 the modern definition of continuity. Lately Cauchy, Weierstrass and Heine also defined as follows (with all numbers in the real number domain

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