W-perfect groups
Selami Ercan (2015)
Open Mathematics
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In the present article we define W-paths of elements in a W-perfect group as a useful tools and obtain their basic properties.
Selami Ercan (2015)
Open Mathematics
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In the present article we define W-paths of elements in a W-perfect group as a useful tools and obtain their basic properties.
P. John, H. Sachs, H. Zernitz (1987)
Applicationes Mathematicae
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Donald W. Crowe (1999)
Visual Mathematics
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Tošić, Ratko, Vojvodić, Dušan (2000)
Novi Sad Journal of Mathematics
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G. L. Garg, B. Kumar (1989)
Matematički Vesnik
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Gordeev, N.L. (2005)
Zapiski Nauchnykh Seminarov POMI
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Tomohiro Yamada (2005)
Colloquium Mathematicae
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We show that there is an effectively computable upper bound of odd perfect numbers whose Euler factors are powers of fixed exponent.
Ivan Gutman (1991)
Publications de l'Institut Mathématique
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Ivan Gutman (1989)
Publications de l'Institut Mathématique
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M. N. Mukherjee, S. Raychaudhuri (1993)
Matematički Vesnik
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Cioabă, Sebastian M. (2004)
The Electronic Journal of Combinatorics [electronic only]
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Min Tang, Xiao-Zhi Ren, Meng Li (2013)
Colloquium Mathematicae
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For a positive integer n, let σ(n) denote the sum of the positive divisors of n. Let d be a proper divisor of n. We call n a near-perfect number if σ(n) = 2n + d, and a deficient-perfect number if σ(n) = 2n - d. We show that there is no odd near-perfect number with three distinct prime divisors and determine all deficient-perfect numbers with at most two distinct prime factors.
Tomislav Doslić (2005)
Discussiones Mathematicae Graph Theory
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It is shown in this note that some matching-related properties of graphs, such as their factor-criticality, regularizability and the existence of perfect 2-matchings, are preserved when iterating Mycielski's construction.
Tom De Medts, Attila Maróti (2013)
Rendiconti del Seminario Matematico della Università di Padova
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