منابع مشابه
The New Periodicity Lemma revisited
Some years ago a New Periodicity Lemma (NPL) was published, showing that the occurrence of two squares at any position i in a string necessarily precludes the occurrence of other squares of specified period in a specified neighbourhood of i. The proof of this lemma was complex, breaking down into 14 subcases, and required that the shorter of the two squares be regular. In this paper we signific...
متن کاملA highly specific test for periodicity.
We present a method that allows to distinguish between nearly periodic and strictly periodic time series. To this purpose, we employ a conservative criterion for periodicity, namely, that the time series can be interpolated by a periodic function whose local extrema are also present in the time series. Our method is intended for the analysis of time series generated by deterministic time-contin...
متن کاملEmily Dickinson revisited: a study of periodicity in her work.
OBJECTIVE Emily Dickinson, arguably one of America's foremost poets, is characterized by critics as able to capture extreme emotional states in her greatest work. Recent dating of her poems offers the periodicity of her writing as a behavior that can be examined for patterns of affective illness that may relate to these states. METHOD The bulk of Dickinson's work was written during a clearly ...
متن کاملGlejser ' s test revisited
Godfrey (1996, Journal of Econometrics 72, 275}299) has shown that the Glejser test for heteroskedasticity is valid only under conditional symmetry. Here, modi"cations of the Glejser test are suggested. The proposed test statistics are asymptotically valid even when the disturbances are not symmetrically distributed and can be used to test for heteroskedasticity when conditional location functi...
متن کاملDavies-Meyer Merkle-Damg̊ard Revisited: Variants of Indifferentiability and Random Oracles
In this paper, we discuss the security of cryptosystems that use hash function DM-MD that is Davies-Meyer Merkle-Damg̊ard with ideal cipher E. DM-MD is not indifferentiable from random oracle (RO) due to the extension attack and the inverse attack. From the indifferentiability theory, there is some cryptosystem that is secure in the RO model but insecure when RO is replaced with DM-MD . However,...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1991
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/251.1.64p