Traducción y análisis de palabras por inteligencia artificial
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number sequence - traducción al ruso
![The plot of a Cauchy sequence (''X<sub>n</sub>''), shown in blue, as ''X<sub>n</sub>'' versus ''n''. In the graph the sequence appears to be converging to a limit as the distance between consecutive terms in the sequence gets smaller as ''n'' increases. In the [[real number]]s every Cauchy sequence converges to some limit.](https://commons.wikimedia.org/wiki/Special:FilePath/Cauchy sequence illustration.svg?width=200 "The plot of a Cauchy sequence (''X<sub>n</sub>''), shown in blue, as ''X<sub>n</sub>'' versus ''n''. In the graph the sequence appears to be converging to a limit as the distance between consecutive terms in the sequence gets smaller as ''n'' increases. In the [[real number]]s every Cauchy sequence converges to some limit.")
![tiling]] with squares whose sides are successive Fibonacci numbers in length.](https://commons.wikimedia.org/wiki/Special:FilePath/Fibonacci blocks.svg?width=200 "tiling]] with squares whose sides are successive Fibonacci numbers in length.")
Wikipedia
Many protocols and algorithms require the serialization or enumeration of related entities. For example, a communication protocol must know whether some packet comes "before" or "after" some other packet. The IETF (Internet Engineering Task Force) RFC 1982 attempts to define "serial number arithmetic" for the purposes of manipulating and comparing these sequence numbers. In short, when the absolute serial number value decreases by more than half of the maximum value (e.g. 128 in an 8-bit value), it is considered to be "after" the former, whereas other decreases are considered to be "before".
This task is rather more complex than it might first appear, because most algorithms use fixed-size (binary) representations for sequence numbers. It is often important for the algorithm not to "break down" when the numbers become so large that they are incremented one last time and "wrap" around their maximum numeric ranges (go instantly from a large positive number to 0 or a large negative number). Some protocols choose to ignore these issues and simply use very large integers for their counters, in the hope that the program will be replaced (or they will retire) before the problem occurs (see Y2K).
Many communication protocols apply serial number arithmetic to packet sequence numbers in their implementation of a sliding window protocol. Some versions of TCP use protection against wrapped sequence numbers (PAWS). PAWS applies the same serial number arithmetic to packet timestamps, using the timestamp as an extension of the high-order bits of the sequence number.
