Alternating Series, Absolute Convergence and Conditional ...
[Pages:7]Alternating Series, Absolute Convergence and Conditional
Convergence
n=1
1
In an Alternating Series, every other term has the opposite sign. AST (Alternating Series Test)
Let a1 - a2 + a3 - a4+... be an alternating series such that an>an+1>0, then the series converges. The error made by estimating the sum, Sn is less than or equal to an+1, i.e. E = |S - Sn| an+1.
2
EX 1 Does an Alternating Harmonic Series converge or diverge? EX 2 Does this series diverge or converge? What is the error estimate
made when approximating the sum using S6?
3
Absolute Convergence
If
converges, then
converges.
EX 3 Does converge or diverge?
4
Absolute Ratio Test
Let
be a series of nonzero terms and suppose
.
i) if < 1, the series converges absolutely.
ii) if > 1, the series diverges.
iii) if = 1, then the test is inconclusive.
EX 4 Show
converges absolutely.
5
Conditional Convergence is conditionally convergent if
converges but
does not.
EX 5 Classify as absolutely convergent, conditionally convergent or divergent.
6
Rearrangement Theorem The terms of an absolutely convergent series can be rearranged without affecting either the convergence or the sum of the series.
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