State the Alternating Series Test.

If $a_n > 0$ , $\lim_{n \to \infty} a_n = 0$ , and $a_n$ is a decreasing sequence, then the alternating series $\sum_{n=1}^{\infty} (-1)^n a_n$ converges.

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State the Alternating Series Test.

If $a_n > 0$ , $\lim_{n \to \infty} a_n = 0$ , and $a_n$ is a decreasing sequence, then the alternating series $\sum_{n=1}^{\infty} (-1)^n a_n$ converges.

What is an alternating series?

A series whose terms alternate in sign.

Define convergence in the context of series.

A series converges if the sequence of its partial sums approaches a finite limit.

Define divergence in the context of series.

A series diverges if the sequence of its partial sums does not approach a finite limit.

What is $a_n$ in the context of the Alternating Series Test?

$a_n$ is the non-alternating part of the series, i.e., the terms without the $(-1)^n$ factor.

What is the general form of an alternating series?

$\sum_{n=1}^{\infty} (-1)^n a_n$ or $\sum_{n=1}^{\infty} (-1)^{n+1} a_n$ , where $a_n > 0$ for all $n$ .

State the first condition for the Alternating Series Test.

$\lim_{n \to \infty} a_n = 0$

State the second condition for the Alternating Series Test.

$a_n$ is a decreasing sequence, i.e., $a_n > a_{n+1}$ for all $n$ beyond some index.

All Flashcards

State the Alternating Series Test.

If $a_n > 0$ , $\lim_{n \to \infty} a_n = 0$ , and $a_n$ is a decreasing sequence, then the alternating series $\sum_{n=1}^{\infty} (-1)^n a_n$ converges.

What is an alternating series?

A series whose terms alternate in sign.

Define convergence in the context of series.

A series converges if the sequence of its partial sums approaches a finite limit.

Define divergence in the context of series.

A series diverges if the sequence of its partial sums does not approach a finite limit.

What is $a_n$ in the context of the Alternating Series Test?

$a_n$ is the non-alternating part of the series, i.e., the terms without the $(-1)^n$ factor.

What is the general form of an alternating series?

$\sum_{n=1}^{\infty} (-1)^n a_n$ or $\sum_{n=1}^{\infty} (-1)^{n+1} a_n$ , where $a_n > 0$ for all $n$ .

State the first condition for the Alternating Series Test.

$\lim_{n \to \infty} a_n = 0$

State the second condition for the Alternating Series Test.

$a_n$ is a decreasing sequence, i.e., $a_n > a_{n+1}$ for all $n$ beyond some index.