On asymptotic estimates for arithmetic cost functions
On asymptotic estimates for arithmetic cost functions
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关于算术成本函数的渐近估计
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发表时间:
1997
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通讯作者:
C. Moreira
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作者:
C. Moreira
Let Or(n) (the cost of n) be the minimum number of arithmetic operations needed to obtain n starting from 1. We prove that Or(n) > log n -log log n for almost all n E N, and, given ? > 0, Or(n) 1 there are i, j, 0 0, we have T((n) > (loglo~gn)l+e for almost all n C N . Here we improve the above results, by proving the following: For almost all n c N we have Tr(n) > lolg nand, for any given E > 0, we have T((n) 0, {T(n) > logn + (1 -)log nloglog logn for almost all n c N, log log n (log log n) 2 T((n) < log n + (3 + s log n log log log n for n large enough. log log n (log log n) 2 foiag nuh Moreover, the first inequality does not depend on the number of binary operations that we can use (provided that this number is finite). Received by the editors October 25, 1994 and, in revised form, August 15, 1995. 1991 Mathematics Subject Classification. Primary 11Y16; Secondary 68Q25, 68Q15, 11B75. ( 1997 American Mathematical Society