Results 11 to 20 of about 143,594 (316)
The isomorphism problem for familiar classes of computable structures I [PDF]
Archive for Mathematical Logic, 2002 Theories of classification distinguish classes with some good structure theorem from those for which none is possible. Some classes (dense linear orders, for instance) are non-classifiable in general, but are classifiable when we consider only countable members.
Wesley Calvert
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Classes of structures with no intermediate isomorphism problems [PDF]
, 2013 We say that a theory $T$ is intermediate under effective reducibility if the isomorphism problems among its computable models is neither hyperarithmetic nor on top under effective reducibility.
Montalbán, Antonio
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Category Theory and New Classes of Semi Bornological Group
Journal of Kufa for Mathematics and Computer, 2023 Because, the new knowledge put every new structure in category theory. So, became a source of interest for many researchers, to put every new structure in category theory. This motivates us to put the new structures of semibornological group in category.
Niran Sabah Jasim +3 more
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Groups with Finitely Many Isomorphism Classes of Non-Normal Subgroups [PDF]
Advances in Group Theory and Applications, 2020 We study groups in which the non-normal subgroups fall into finitely many isomorphism classes. We prove that a locally generalized radical group with this property is abelian-by-finite and minimax.
Leonid A. Kurdachenko +2 more
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On the Isomorphism Classes of Transversals [PDF]
Communications in Algebra, 2008 9 ...
Jain, V. K., Shukla, R. P.
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On the number of isomorphism classes of transversals [PDF]
Proceedings - Mathematical Sciences, 2013 In this paper we prove that there does not exist a subgroup $H$ of a finite group $G$ such that the number of isomorphism classes of normalized right transversals of $H$ in $G$ is four.
Kakkar, Vipul, Shukla, R. P.
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Efficient Enumeration of Higher Order Algebraic Structures
IEEE Access, 2020 Algebraic structures are widely studied mathematical structures in abstract algebra. Enumerating higher order algebraic structures is a computationally intensive task due to large number of possible permutations and the presence of many symmetrically ...
Majid Ali Khan
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On groups with two isomorphism classes of central factors [PDF]
International Journal of Group Theory, 2018 The structure of groups which have at most two isomorphism classes of central factors ($B_2$-groups) are investigated. A complete description of $B_2$-groups is obtained in the locally finite case and in the nilpotent case.
Serena Siani
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On the Genus of the Idempotent Graph of a Finite Commutative Ring
Discussiones Mathematicae - General Algebra and Applications, 2021 Let R be a finite commutative ring with identity. The idempotent graph of R is the simple undirected graph I(R) with vertex set, the set of all nontrivial idempotents of R and two distinct vertices x and y are adjacent if and only if xy = 0.
Belsi G. Gold, Kavitha S., Selvakumar K.
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Isomorphs of a class of Queueing systems [PDF]
International Journal of Mathematics and Mathematical Sciences, 1979 Restricted isomorphism between two queueing systems implies that they have equivalent distribution function for at least one (but not all) output elements (e.g. waiting time, queue size, idle time, etc.). Quasi‐isomorphism implies an approximate equivalence.
A. Ghosal, Sudhir Madan
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