Einstein-Maxwell equation on four-dimensional homogeneous spaces.
Komrakov, B.jun. (2001)
Lobachevskii Journal of Mathematics
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Komrakov, B.jun. (2001)
Lobachevskii Journal of Mathematics
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G. Ananda Swarup (1971)
Mathematische Zeitschrift
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J. Dorfmeister, Zhuang-Dan Guan (1992)
Commentarii mathematici Helvetici
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K. Orlov, M. Stojanović (1974)
Matematički Vesnik
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H. B. Potoczny (1984)
Matematički Vesnik
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Jacob Burbea (1981)
Annales Polonici Mathematici
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Pap, Endre, Ralević, Nebojša M. (1999)
Novi Sad Journal of Mathematics
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Rajab Ali Borzooei, Arsham Borumand Saeid, Akbar Rezaei, Akefe Radfar, Reza Ameri (2013)
Discussiones Mathematicae - General Algebra and Applications
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In this paper, we introduce the notion of pseudo BE-algebra which is a generalization of BE-algebra. We define the concepts of pseudo subalgebras and pseudo filters and prove that, under some conditions, pseudo subalgebra can be a pseudo filter. We prove that every homomorphic image and pre-image of a pseudo filter is also a pseudo filter. Furthermore, the notion of pseudo upper sets in pseudo BE-algebras introduced and is proved that every pseudo filter is an union of pseudo upper sets. ...
Gadea, P. M., Oubiña, J. A. (2003)
International Journal of Mathematics and Mathematical Sciences
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Jürgen Schmidt, Constantine Tsinakis (1977)
Mathematische Zeitschrift
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Grzegorz Dymek (2015)
Discussiones Mathematicae - General Algebra and Applications
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The notions of a period of an element of a pseudo-BCI-algebra and a periodic pseudo-BCI-algebra are defined. Some of their properties and characterizations are given.
Akbar Rezaei, Arsham Borumand Saeid, Andrzej Walendziak (2017)
Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica
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The notions of a dual pseudo-Q algebra and a dual pseudo-QC algebra are introduced. The properties and characterizations of them are investigated. Conditions for a dual pseudo-Q algebra to be a dual pseudo-QC algebra are given. Commutative dual pseudo-QC algebras are considered. The interrelationships between dual pseudo-Q/QC algebras and other pseudo algebras are visualized in a diagram.
Kurt Meyberg, J. Marshall Osborn (1993)
Mathematische Zeitschrift
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