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Infinite Series Convergence Tests

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

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

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P-Series: ∑n=1∞1np\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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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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Alternating Series Estimation Theorem

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Provides an estimate for the sum of an alternating series

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Telescoping Series: ∑(an−an+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 lim⁡n→∞an≠0\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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Harmonic Series: ∑n=1∞1n\sum_{n=1}^{\infty} \frac{1}{n}

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No specific test, Diverges

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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 lim⁡n→∞an=0\lim_{n \to \infty} a_n = 0

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Ratio Test: ∑an\sum a_n, using lim⁡n→∞∣an+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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Root Test: ∑an\sum a_n, using lim⁡n→∞∣an∣n\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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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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Comparison Test: ∑an\sum a_n compared with ∑bn\sum b_n, where 0≤an≤bn0 \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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Limit Comparison Test: ∑an\sum a_n compared with ∑bn\sum b_n, using lim⁡n→∞anbn\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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