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4 matching pages
1: 27.2 Functions
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►Euclid’s Elements (Euclid (1908, Book IX, Proposition 20)) gives an elegant proof that there are infinitely many primes.
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►An equivalent form states that the th prime (when the primes are listed in increasing order) is asymptotic to as :
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27.2.8
►and if is the smallest positive integer such that , then is a primitive root mod .
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2: 26.5 Lattice Paths: Catalan Numbers
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►(Sixty-six equivalent definitions of are given in Stanley (1999, pp. 219–229).)
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§26.5(iv) Limiting Forms
…3: 26.9 Integer Partitions: Restricted Number and Part Size
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►The conjugate partition is obtained by reflecting the Ferrers graph across the main diagonal or, equivalently, by representing each integer by a column of dots.
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►Equations (26.9.2)–(26.9.3) are examples of closed forms that can be computed explicitly for any positive integer .
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►equivalently, partitions into at most parts either have exactly parts, in which case we can subtract one from each part, or they have strictly fewer than parts.
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§26.9(iv) Limiting Form
…4: 2.11 Remainder Terms; Stokes Phenomenon
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►That the change in their forms is discontinuous, even though the function being approximated is analytic, is an example of the Stokes
phenomenon.
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►In the transition through , changes very rapidly, but smoothly, from one form to the other; compare the graph of its modulus in Figure 2.11.1 in the case .
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►The process just used is equivalent to re-expanding the remainder term of the original asymptotic series (2.11.24) in powers of and truncating the new series optimally.
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►For example, using double precision is found to agree with (2.11.31) to 13D.
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►Their extrapolation is based on assumed forms of remainder terms that may not always be appropriate for asymptotic expansions.
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