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Infinite Series Convergence Tests

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Root Test: an\sum a_n, using limnann\lim_{n \to \infty} \sqrt[n]{|a_n|}

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Converges if limit is less than 1, diverges if limit is greater than 1 or infinite, test is inconclusive if limit equals 1

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Geometric Series: n=0arn\sum_{n=0}^{\infty} ar^n

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Test: Geometric Series Test, Converges if r<1|r| < 1

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Integral Test: an\sum a_n where an=f(n),fa_n = f(n), f is positive, continuous, and decreasing

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Compares with the integral of ff, converges if the integral is finite, otherwise diverges

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Alternating Series Estimation Theorem

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Provides an estimate for the sum of an alternating series

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Harmonic Series: n=11n\sum_{n=1}^{\infty} \frac{1}{n}

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No specific test, Diverges

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P-Series: n=11np\sum_{n=1}^{\infty} \frac{1}{n^p}

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Test: P-Series Test, Converges if p>1p > 1

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Telescoping Series: (anan+1)\sum (a_n - a_{n+1})

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Evaluates series by summing differences that cancel out successive terms, converges if the sequence of partial sums converges

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Divergence Test: an\sum a_n

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If limnan0\lim_{n \to \infty} a_n \neq 0, then an\sum a_n diverges

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Cauchy Condensation Test: an\sum a_n for ana_n non-increasing and non-negative

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an\sum a_n converges or diverges with 2na2n\sum 2^n a_{2^n}

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Alternating Series: n=1(1)nan\sum_{n=1}^{\infty} (-1)^n a_n

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Test: Alternating Series Test, Converges if (an)(a_n) is decreasing and limnan=0\lim_{n \to \infty} a_n = 0

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Limit Comparison Test: an\sum a_n compared with bn\sum b_n, using limnanbn\lim_{n \to \infty} \frac{a_n}{b_n}

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If the limit is positive and finite, both series converge or diverge together

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Absolute Convergence Test: an\sum a_n

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If an\sum |a_n| converges, then an\sum a_n converges absolutely

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Ratio Test: an\sum a_n, using limnan+1an\lim_{n \to \infty} \left| \frac{a_{n+1}}{a_n} \right|

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Converges if limit is less than 1, diverges if limit is greater than 1 or infinite, test is inconclusive if limit equals 1

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Comparison Test: an\sum a_n compared with bn\sum b_n, where 0anbn0 \leq a_n \leq b_n

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If bn\sum b_n converges, then an\sum a_n also converges; if an\sum a_n diverges, then bn\sum b_n also diverges

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Conditional Convergence: an\sum a_n

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If an\sum a_n converges but an\sum |a_n| diverges, the series converges conditionally

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