منابع مشابه
On infinite families of sequences with one and two valued autocorrelation and two valued crosscorrelation function
We show how to construct infinite families of sequences that have one and two valued autocorrelation and two valued crosscorrelation function. These sequences are obtained via the discrete Fourier transform of integer sequences. The sequences obtained can be complex valued or having entries E {O, 1, ... , p}, p prime, depending on the construction used.
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For a given block design D, we consider two isomorphism invariants, the eccentric sequences and the triangle sequences of some special graphs of D. Among other results we show that these invariants can often be used effectively, as far as computational complexity is concerned, in isomorphism testing of designs. Several unsolved problems are also proposed.
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W.T.Gowers proved in [G1] the celebrated dichotomy concerning unconditional sequences and hereditarily indecomposable spaces using Ramsey-type argumentation. In [G2] he generalized the reasoning and showed, as an application, a dichotomy concerning quasiminimal spaces, ie. in which any two infinitely dimensional subspaces contain further two infinitely dimensional subspaces which are isomorphic...
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ژورنال
عنوان ژورنال: International Journal of Pure and Apllied Mathematics
سال: 2013
ISSN: 1311-8080,1314-3395
DOI: 10.12732/ijpam.v84i3.1