• Honam Mathematical Journal
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• v.32 no.1
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• pp.77-84
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• 2010

In this paper, we introduce the notion of almost minimal precontinuous function and investigate characterizations for such a function.

• Bulletin of the Korean Mathematical Society
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• v.48 no.3
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• pp.611-616
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• 2011

The reflexiveness and reversibility were introduced by Mason and Cohn respectively. The structures of minimal reversible rings and minimal reflexive rings are completely determined. The term minimal means having smallest cardinality.

• Communications of the Korean Mathematical Society
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• v.10 no.4
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• pp.899-906
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• 1995

We discuss certain structure theorems in the class A which is closely related to the study of the problems of solving systems concerning the predual of a dual operator algebra generated by a contraction on a separable infinite dimensional complex Hilbert space.

• Journal of the Korean Mathematical Society
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• v.54 no.2
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• pp.507-516
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• 2017

Real Bott manifolds is a class of flat manifolds with holonomy group $\mathbb{Z}^k_2$ of diagonal type. In this paper we formulate necessary and sufficient conditions of the existence of a Spin-structure on real Bott manifolds. It extends results of [9].

• Communications of the Korean Mathematical Society
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• v.10 no.1
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• pp.187-194
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• 1995

We are to present some properties of binary relations by means of categorical method. The concept of semi-topogenous structures is due to Cs$\acute{a}$sz$\acute{a}$r. Using this, we give a new definition of a $\sigma$-topogenous structure as a particular type of semi-topogenous structure.

• Bulletin of the Korean Mathematical Society
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• v.29 no.1
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• pp.41-55
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• 1992

The characteristic free representation theory of the general linear group is one of the powerful tools in the study of invariant theory, algebraic geometry, and commutative algebra. Recently the study of such representations became a popular theme. In this paper we study the representation-theoretic structures of the symmetric algebra and the exterior algebra over a commutative ring with unity 1.

• East Asian mathematical journal
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• v.21 no.1
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• pp.27-39
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• 2005

We will define p-stack convergence spaces and show that each neighborhood structure is uniquely determined by p-stack convergence structure. Also, we will show that p-stack convergence spaces are a generalization of neighborhood spaces.

• Journal of the Chungcheong Mathematical Society
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• v.22 no.4
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• pp.667-673
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• 2009

In this paper, we introduce the notions of minimal precontinuity, m-preclosed graph, almost m-precompact and m-precompact and investigate some properties for such notions.

• Journal of the Chungcheong Mathematical Society
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• v.20 no.3
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• pp.211-221
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• 2007

In this paper, we define ${\bigwedge}$-structure, ${\bigvee}$-structure to generalize some lattices, and study the conditions that a lattice which has ${\bigwedge}$-structure or ${\bigvee}$-structure to be continuous or algebraic.

• Journal of the Korean Mathematical Society
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• v.37 no.2
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• pp.193-223
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• 2000

In the late 1970's, M. Kuranishi proposed to control the moduli of the germ of a normal Stein space by deformations of the CR structure on the boundary. I this paper, we will see that it is naturally accomplished by considering stably embeddable deformations of CR structures.