{"id":10713,"date":"2017-09-21t11:24:23","date_gmt":"2017-09-21t18:24:23","guid":{"rendered":"\/\/www.catharsisit.com\/hs\/?p=10713"},"modified":"2017-09-21t11:24:45","modified_gmt":"2017-09-21t18:24:45","slug":"ap-calculus-bc-review-absolute-conditional-convergence","status":"publish","type":"post","link":"\/\/www.catharsisit.com\/hs\/ap\/ap-calculus-bc-review-absolute-conditional-convergence\/","title":{"rendered":"ap calculus bc review: absolute and conditional convergence"},"content":{"rendered":"
any given series either converges<\/em> or diverges<\/em>. but did you realize that there were different kinds of convergence? in this review article, we’ll take a look at the difference between absolute and conditional convergence. along the way, we’ll see a few examples and discuss important special cases.<\/p>\n
absolute and conditional convergence<\/h2>\n
if a series has a finite sum, then the series converges<\/strong>. otherwise, the series diverges<\/strong>.<\/p>\n
however, we do make a distinction between series that converge very strongly, and those that only just barely<\/em> converge. it all boils down to the signs of the terms.<\/p>\n
\n
\na series σan<\/sub><\/em> converges absolutely<\/strong> if the series of the absolute values of its terms converges. that is, if σ|an<\/sub><\/em>| also converges.<\/li>\n
a series σan<\/sub><\/em> converges conditionally<\/strong> if the series converges but the associated series of absolute values σ|an<\/sub><\/em>| diverges.<\/li>\n<\/ul>\n
classifying series<\/h3>\n
it’s important to realize that both absolute and conditional convergence are still types of convergence. it’s not that a conditionally convergent series sometimes<\/em> converges and sometimes not. instead, we’re talking about the behavior of a related series: what happens when we get rid of all the negative signs in the series?<\/em> if the new series of all positive terms also<\/em> converges, then the original series converges in the strongest possible sense (absolute convergence).<\/p>\n