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12 Generating Functions - MIT OpenCourseWare

Mcs-ftl 2010/9/8 0:40 page 355 #36112 Generating FunctionsGenerating Functions are one of the most surprising and useful inventions in Dis-crete Math. Roughly speaking, Generating Functions transform problems aboutse-quencesinto problems aboutfunctions. This is great because we ve got piles ofmathematical machinery for manipulating Functions . Thanks to Generating func-tions, we can then apply all that machinery to problems about sequences. In thisway, we can use Generating Functions to solve all sorts of counting problems. Theycan also be used to find closed-form expressions for sums and to solve fact, many of the problems we addressed in Chapters 9 11 can be formulatedand solved using Generating Definitions and ExamplesTheordinary Generating functionfor the sequence1hg0;g1;g2;g3:::iis the :There are a few oth

In general, differentiating a generating function has two effects on the corre- sponding sequence: each term is multiplied by its index and the entire sequence is shifted left one place.

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