Results 131 to 140 of about 153,244 (275)

Homomorphisms and amalgamation

Discrete Mathematics, 2003
We prove that for each finite core graph G, the class of all graphs admitting a homomorphism into G is a pseudo-amalgamation class, in the sense of Fraisse. This fact gives rise to a countably infinite universal pseudo-homogeneous graph which shares some of the properties of the infinite random graph. Our methods apply simultaneously to G-colourings in
openaire   +2 more sources

L(2, 1)-Labelings of Some Families of Oriented Planar Graphs

Discussiones Mathematicae Graph Theory, 2014
In this paper we determine, or give lower and upper bounds on, the 2-dipath and oriented L(2, 1)-span of the family of planar graphs, planar graphs with girth 5, 11, 16, partial k-trees, outerplanar graphs and cacti.
Sen Sagnik
doaj   +1 more source

n-Jordan homomorphisms [PDF]

arXiv, 2008
Let $n\in \Bbb N,$ and let $A,B$ be two rings. An additive map $h: A\to B$ is called n-Jordan homomorphism if $h(a^n)=(h(a))^n$ for all $a \in {A}$. Every Jordan homomorphism is an n-Jordan homomorphism, for all $n\geq 2,$ but the converse is false, in general. In this paper we investigate the n-Jordan homomorphisms on Banach algebras.
arxiv  

Homomorphic and restricted homomorphic products of softgraphs

Journal of the Nigerian Society of Physical Sciences
Molodtsov pioneered the notion of soft set theory, presenting it as a mathematical tool for dealing with uncertainty. Numerous researchers have subsequently developed models leveraging this theory to tackle challenges in decision-making and medical diagnosis.
Jinta Jose, Rajesh K. Thumbakara, J. D. Thenge Mashale, Bobin George, Sijo P. George   +4 more
openaire   +2 more sources

Vague Soft Hypergroups and Vague Soft Hypergroup Homomorphism

Advances in Fuzzy Systems, 2014
We introduce and develop the initial theory of vague soft hyperalgebra by introducing the novel concept of vague soft hypergroups, vague soft subhypergroups, and vague soft hypergroup homomorphism.
Ganeshsree Selvachandran, A. R. Salleh
semanticscholar   +1 more source

Bipolar fuzzy INK-subalgebras of INK-algebras

AIMS Mathematics
This article presents a new idea for an extension of the fuzzy INK algebra called bipolar fuzzy INK subalgebra. The objective of this study is to define the features that distinguish bipolar fuzzy INK-subalgebras of INK-algebras. The algebraic operations
Remala Mounikalakshmi , Tamma Eswarlal, Chiranjibe Jana   +2 more
doaj   +1 more source

Minimum Cost Homomorphisms to Reflexive Digraphs

, 2007
For digraphs $G$ and $H$, a homomorphism of $G$ to $H$ is a mapping $f:\ V(G)\dom V(H)$ such that $uv\in A(G)$ implies $f(u)f(v)\in A(H)$. If moreover each vertex $u \in V(G)$ is associated with costs $c_i(u), i \in V(H)$, then the cost of a homomorphism
Gupta, Arvind, Hell, Pavol, Karimi, Mehdi, Rafiey, Arash   +3 more
core   +1 more source

Degree-Constrained Minimum Spanning Hierarchies in Graphs

Algorithms
The minimum spanning tree problem in graphs under budget-type degree constraints (DCMST) is a well-known NP-hard problem. Spanning trees do not always exist, and the optimum can not be approximated within a constant factor.
Miklos Molnar
doaj   +1 more source

A Characterization of Jordan Homomorphism on Banach Algebras

, 2014
Let and be Banach algebras and let be a Jordan homomorphism. We show that, under special hypotheses, is ring homomorphism. Some related results are given as well.
A. Zivari-kazempour
semanticscholar   +1 more source

Ordered Kernels of OBCI-Algebras in the Homomorphism Environment

Mathematics
Yang, Roh and Jun recently introduced kernels of homomorphisms in OBCI-algebras and left an ordered generalization of those kernels as a future work.
Eunsuk Yang, Eun-Hwan Roh, Young-Bae Jun
doaj   +1 more source