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education/math/MATH1220 (calc II)/Sequences.md

@@ -98,4 +98,8 @@ The above series converges if all three of the following hold true:
 - $a_n > 0$
 - Series decreases: $a_n \ge a_{n+1}$  for all $n$
 - $\lim_{n\to\infty} a_n = 0$ as_
-This test does not provide any guarantees about divergence i.e if if the test fails, the series does not necessarily diverge.
+This test does not provide any guarantees about divergence i.e if if the test fails, the series does not necessarily diverge.
+
+A sequence a_n converges absolutely if sum `|a_n|` converges
+
+Then if the series converges absolutely then the sum converges.