All the areas covered in this topic are Sequence of real numbers, the convergence of sequences, bounded and monotone sequences, convergence criteria for sequences of real numbers. Apart from that, there are Cauchy sequences and sub-sequences, Bolzano-Weierstrass theorem. Also, there are Series of real numbers, absolute convergence, tests of convergence for series of positive terms that includes comparison test, ratio test, root test and also Leibniz test for convergence of alternating series, etc.