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Sequences and summations

1M. HauskrechtCS 441 Discrete mathematics for CSCS 441 Discrete Mathematics for CSLecture 10 Milos Sennott SquareSequences and summationsM. HauskrechtCS 441 Discrete mathematics for CSSequencesDefinition:A sequenceis a functionfrom a subset of the set of integers (typically the set {0,1,2,..} or the set {1,2,3,..} to a set S. We use the notation anto denote the image of the integer n. We call ana term of the sequence. Notation:{an} is used to represent the sequence (note {} is the same notation used for sets, so be careful). {an} represents the ordered list a1, a2, a3, ..{an}1 2 3 4 5 6 .. HauskrechtCS 441 Discrete mathematics for CSSequencesExamples: (1) an= n2, where n = 1,2, What are the elements of the sequence? 1, 4, 9, 16, 25, .. (2) an= (-1) n, where n=0,1,2,3,.. Elements of the sequence?1, -1, 1, -1, 1, .. 3) an= 2 n, where n=0,1,2,3,.. Elements of the sequence?

1 CS 441 Discrete mathematics for CS M. Hauskrecht CS 441 Discrete Mathematics for CS Lecture 10 Milos Hauskrecht milos@cs.pitt.edu 5329 Sennott Square Sequences and summations

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