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[parent] convergence of a sequence with finite upcrossings (Theorem)

The following result characterizes convergence of a sequence in terms of finiteness of numbers of upcrossings.

Theorem   A sequence $x_1,x_2,\ldots$ of real numbers converges to a limit in the extended real numbers if and only if the number of upcrossings $U[a,b]$ is finite for all $a<b$

Since the number of upcrossings $U[a,b]$ differs from the number of downcrossings $D[a,b]$ by at most one, the theorem can equivalently be stated in terms of the finiteness of $D[a,b]$




"convergence of a sequence with finite upcrossings" is owned by gel.
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See Also: upcrossings and downcrossings

Keywords:  upcrossing, downcrossing

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proof of convergence of a sequence with finite upcrossings (Proof) by gel
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Cross-references: downcrossings, number, extended real numbers, converges, real numbers, upcrossings, sequence

This is version 1 of convergence of a sequence with finite upcrossings, born on 2009-02-15.
Object id is 11630, canonical name is ConvergenceOfASequenceWithFiniteUpcrossings.
Accessed 337 times total.

Classification:
AMS MSC60G17 (Probability theory and stochastic processes :: Stochastic processes :: Sample path properties)
 40A05 (Sequences, series, summability :: Convergence and divergence of infinite limiting processes :: Convergence and divergence of series and sequences)

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