Numerical Sequences and Series - 國立臺灣大學
www.csie.ntu.edu.tw › ~b89089 › bookNumerical Sequences and Series Written by Men-Gen Tsai email: b89902089@ntu.edu.tw 1. Prove that the convergence of {s n} implies convergence of {|s n|}. Is the converse true? Solution: Since {s n} is convergent, for any > 0, there exists N such that |s n − s| < whenever n ≥ N. By Exercise 1.13 I know that ||s n|−|s|| ≤ |s n −s|. Thus ...
Sequences and Series
users.math.msu.edu › users › yanbSequences and Series 2.1. The Limit of a Sequence De nition 2.1. A sequence is a function whose domain is N:If this function is denoted by f, then the values f(n) (n2N) determine the sequence uniquely, and vise-versa. Therefore, a sequence is usually denoted by (a 1;a 2;a 3;a 4; ) or (a n) 1 n=1; where a n= f(n) for n2N:
Numerical Sequences and Series
users.math.msu.edu › users › yanbNumerical Sequences and Series 3.1. Convergent Sequences De nition 3.1. A sequence fp ngin a metric space Xis said to converge in Xif there is a point p2Xwith the following property: For every number >0, there exists an integer N2N such that whenever n2N and n Nit follows that d(p n;p) < :That is, fp ngis said to converge in Xif the following ...