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For questions about real analysis, a branch of mathematics dealing with limits, convergence of sequences, construction of the real numbers, least upper bound property and related analysis topics, such as continuity, differentiation, and integration through the Fundamental Theorem of Calculus.

Real analysis (traditionally, the theory of functions of a real variable) is a branch of mathematical analysis dealing with the real numbers and real-valued functions of real variables. In particular, it deals with the analytic properties of real functions and sequences, including convergence and limits of sequences of real numbers, the calculus of the real numbers, continuity, smoothness and related properties of real-valued functions.

It includes measure theory, integration theory, Lebesgue measures and integration, differentiation of measures, continuity and derivatives.

Source: https://en.wikipedia.org/wiki/Real_analysis

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