On the number of m-term zero-sum subsequences
David J. Grynkiewicz (2006)
Acta Arithmetica
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David J. Grynkiewicz (2006)
Acta Arithmetica
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Maria Jankiewicz (1974)
Applicationes Mathematicae
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Mária Guregová, Alexander Rosa (1968)
Matematický časopis
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K. T. Phelps (1980)
Colloquium Mathematicae
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Edjvet, Martin, Hammond, Paul, Thomas, Nathan (2001)
Experimental Mathematics
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K Chikawa, K Iséki, T Kusakabe (1962)
Acta Arithmetica
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Yakovlev, A.V. (2004)
Zapiski Nauchnykh Seminarov POMI
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Béla Nagy (2013)
Studia Mathematica
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Two characterizations of the reductivity of a cyclic normal operator in Hilbert space are proved: the equality of the sets of cyclic and *-cyclic vectors, and the equality L²(μ) = P²(μ) for every measure μ equivalent to the scalar-valued spectral measure of the operator. A cyclic subnormal operator is reductive if and only if the first condition is satisfied. Several consequences are also presented.
Jafari, F., Raposa, R. (1999)
International Journal of Mathematics and Mathematical Sciences
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K Chikawa, K Iséki, T Kusakabe, K Shibamura (1962)
Acta Arithmetica
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