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Test the series for convergence or divergence.$ \displaystyle \sum_{n = 1}^{\infty} (-1)^{n-1} $ arctan $ n $

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Calculus 2 / BC

Chapter 11

Infinite Sequences and Series

Section 5

Alternating Series

Sequences

Series

Missouri State University

Harvey Mudd College

University of Michigan - Ann Arbor

Idaho State University

Lectures

01:59

In mathematics, a series is, informally speaking, the sum of the terms of an infinite sequence. The sum of a finite sequence of real numbers is called a finite series. The sum of an infinite sequence of real numbers may or may not have a well-defined sum, and may or may not be equal to the limit of the sequence, if it exists. The study of the sums of infinite sequences is a major area in mathematics known as analysis.

02:28

In mathematics, a sequence is an enumerated collection of objects in which repetitions are allowed. Like a set, it contains members (also called elements, or terms). The number of elements (possibly infinite) is called the length of the sequence. Unlike a set, order matters, and exactly the same elements can appear multiple times at different positions in the sequence. Formally, a sequence can be defined as a function whose domain is either the set of the natural numbers (for infinite sequences) or the set of the first "n" natural numbers (for a finite sequence). A sequence can be thought of as a list of elements with a particular order. Sequences are useful in a number of mathematical disciplines for studying functions, spaces, and other mathematical structures using the convergence properties of sequences. In particular, sequences are the basis for series, which are important in differential equations and analysis. Sequences are also of interest in their own right and can be studied as patterns or puzzles, such as in the study of prime numbers.

0:00

Test the series for conver…

04:27

00:38

Let's test this Siri's for conversions or diversions, so recall that the limit of our ten is five or two. This means that in the limit. So here's our a n This does not exist, sends his end, gets large We'LL have negative one and minus one and then we'LL be getting closer to a pie over too. So this will equal plus or minus pi over too. So this is escalating. So this is why it doesn't exist. So bye, The diversions test sense. Lim is not equal to zero. The Siri's diverges and that's our final answer.

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