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ZixuanZhang
ZixuanZhang
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Sequence convergence

converges if for some limit ; otherwise it diverges.

Definition 5.17 (Sequence Convergence)
If there is a limit such that as , we say that the sequence converges. Otherwise, we say that it diverges.

Examples

Examples grounded in the definition:

  • converges to : given , the Axiom of Archimedes supplies , and then for all .

  • The sequence defined by for even and for odd converges to by the same choice of , treating the two parities separately.

  • converges to , since .

  • The alternating sequence diverges: with , no tail can stay within of any proposed limit, since . Divergence does not require the terms to tend to infinity.

Related

Stated in