1. Convergence and Divergence Tests for Series Test When to ...
1. Convergence and Divergence Tests for Series
Test Divergence Test Integral Test Comparison Test Limiting Comparison Test
Convergent test for alternating Series Absolute Convergence Conditional Convergence
Ratio Test: Root Test:
When to Use
for any series an
n=0
an with an 0 and an decreasing
n=0
an and bn
n=0
n=0
if 0 an bn
an, (an > 0). Choose bn, (bn > 0)
n=0
if lim an = L n bn
n=0
with 0 < L <
if lim an = 0 n bn
if lim an = n bn
(-1)nan (an > 0)
n=0
for any series an
n=0
for any series an
n=0
For any series an,
n=0
Calculate lim an+1 = L n an
Calculate lim n |an| = L
n
Conclusions
Diverges if lim |an| = 0.
n
f (x)dx and an both converge/diverge
1
n=0
where f (n) = an.
bn converges = an converges.
n=0
n=0
an diverges = bn diverges.
n=0
n=0
an and bn both converge/diverge
n=0
n=0
bn converges = an converges.
n=0
n=0
bn diverges = an diverges.
n=0
n=0
converges if
lim an = 0 and an is decreasing
n
If |an| converges, then an converges,
n=0
n=0
(definition of absolutely convergent series.)
if |an| diverges but an converges.
n=0
n=0
an conditionally converges
n=0
there are 3 cases:
if L < 1, then |an| converges ;
n=0
if L > 1, then |an| diverges;
n=0
if L = 1, no conclusion can be made.
2. Important Series to Remember
Series Geometric Series p-series
How do they look
arn
n=0
1 np
n=1
Conclusions
a
Converges to
if |r| < 1 and diverges if |r| 1
1-r
Converges if p > 1 and diverges if p 1
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