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单词 sequence
释义
sequence

Mathematics
  • A finite sequence consists of n terms a1, a2,…, an, in a given order, where n is the length of the sequence. An infinite sequence consists of terms a1, a2, a3,…, one corresponding to each positive integer. Sometimes, it is more convenient to denote the terms of a sequence by a0, a1, a2,…. Addition and scalar multiplication of sequences are defined componentwise, and so the set of sequences forms a vector space (see c, lp). See also limit (of a sequence), series.


Computer
  • 1. A function whose domain is the set of positive integers (or sometimes the set of nonnegative integers). The image set can thus be listed s1,s2,… where si is the value of the function given argument i. A finite sequence (or list) is a function whose domain is

    {1,2,,n}forn1
    and hence whose image set can be listed
    s1,s2,,sn

    2. The listing of the image set of a sequence. Hence it is another name for string.


Logic
  • A generalization of the notion of a set in which elements are linearly ordered and may appear more than once, i.e., a tuple of elements. Sequences are important in sequent calculi, as some presentations of sequents assume that cedents—the sets of formulae appearing in a sequent—are sequences.


Philosophy
  • See ordered n-tuple.


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