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  2. Limit of a sequence - Wikipedia

    en.wikipedia.org/wiki/Limit_of_a_sequence

    A sequence that does not converge is said to be divergent. [3] The limit of a sequence is said to be the fundamental notion on which the whole of mathematical analysis ultimately rests. [1] Limits can be defined in any metric or topological space, but are usually first encountered in the real numbers.

  3. Divergent series - Wikipedia

    en.wikipedia.org/wiki/Divergent_series

    In mathematics, a divergent series is an infinite series that is not convergent, meaning that the infinite sequence of the partial sums of the series does not have a finite limit. If a series converges, the individual terms of the series must approach zero. Thus any series in which the individual terms do not approach zero diverges.

  4. Convergent series - Wikipedia

    en.wikipedia.org/wiki/Convergent_series

    If r > 1, then the series diverges. If r = 1, the ratio test is inconclusive, and the series may converge or diverge. Root test or nth root test. Suppose that the terms of the sequence in question are non-negative. Define r as follows: = | |,

  5. Sequence - Wikipedia

    en.wikipedia.org/wiki/Sequence

    A sequence that does not converge is divergent. Informally, a sequence has a limit if the elements of the sequence become closer and closer to some value ...

  6. Harmonic series (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Harmonic_series_(mathematics)

    Beyond music, harmonic sequences have also had a certain popularity with architects. This was so particularly in the Baroque period, when architects used them to establish the proportions of floor plans , of elevations , and to establish harmonic relationships between both interior and exterior architectural details of churches and palaces.

  7. Convergence tests - Wikipedia

    en.wikipedia.org/wiki/Convergence_tests

    If r > 1, then the series diverges. If r = 1, the root test is inconclusive, and the series may converge or diverge. The root test is stronger than the ratio test: whenever the ratio test determines the convergence or divergence of an infinite series, the root test does too, but not conversely. [1]

  8. Convergence of random variables - Wikipedia

    en.wikipedia.org/wiki/Convergence_of_random...

    In general, convergence in distribution does not imply that the sequence of corresponding probability density functions will also converge. As an example one may consider random variables with densities f n (x) = (1 + cos(2πnx))1 (0,1).

  9. Series (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Series_(mathematics)

    This means that if the original series converges, so does the new series after grouping: all infinite subsequences of a convergent sequence also converge to the same limit. However, if the original series diverges, then the grouped series do not necessarily diverge, as in this example of Grandi's series above.