• East Asian mathematical journal
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• v.35 no.1
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• pp.91-98
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• 2019

This paper is concerned with the global existence of strong solution for the controlled ode-pde systems. Also, we consider the continuous dependence of solution on the control.

• East Asian mathematical journal
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• v.35 no.1
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• pp.109-115
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• 2019

The purpose of this paper is to investigate various kinds of degeneracy of maximal surfaces in ${\mathbb{L}}^n$ in view of the generalized Gauss map.

• East Asian mathematical journal
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• v.35 no.5
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• pp.529-534
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• 2019

The purpose of this article is to present The $Carath{\acute{e}}odory$-Cartan-Kaup-Wu theorem for connected Kobayashi hyperbolic almost complex manifolds.

• East Asian mathematical journal
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• v.37 no.1
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• pp.131-140
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• 2021

The purpose of this paper is to investigate various kinds of degeneracy of maximal surfaces in ��4 in view of the generalized Gauss map.

• East Asian mathematical journal
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• v.39 no.5
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• pp.515-522
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• 2023

In the case that the set of sorts is countable, we will prove that any sorted profinite group has the unique SEP-cover using the notion of prime model in model theory.

• East Asian mathematical journal
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• v.25 no.1
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• pp.69-87
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• 2009

In this paper we characterize f-derivations of a BCI-algebra as well as its center.

• East Asian mathematical journal
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• v.25 no.4
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• pp.487-494
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• 2009

We show that if two virtual link diagrams which are normal are equivalent under generalized Reidemeister moves, then they are equivalent under generalized Reidemeister moves preserving the normality of diagrams.

• East Asian mathematical journal
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• v.39 no.1
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• pp.37-42
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• 2023

The purpose of this paper is to establish the notion of semi-Riemannian manifolds M with the homogeneous geodesics, and investigate properties about certain homogeneity.

• Education of Primary School Mathematics
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• v.22 no.3
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• pp.167-180
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• 2019

This study analyzed the effects of the educational contextual variables on fourth grade students' mathematics achievement in five East Asian countries(Singapore, Hong Kong Taiwan, Japan and Korea) using TIMSS 2015 data. There are four findings of this study. The first is that the common student-home-level variables that give significant influence on the mathematics achievement in all 5 countries are 'Home resources for learning' and 'Parents' educational expectations'. But 'Literacy and numeracy activities before entering a school' and 'Parents' attitude for mathematics and science' are not common variables. The second is that 'Students' interest in math learning' gave significant influence on the mathematics achievement of in all 5 countries. The third is that 'Teaching limited by student needs' does not give significant influence on the math achievement in Korea, Taiwan, and Japan but in Singapore and Hong Kong. The fourth is that 'Student economic background' gave more significant influence in Korea, Taiwan, and Japan than Singapore and Hong Kong. Suggestions to improve elementary school mathematics teaching and learning are discussed in the conclusion.

• East Asian mathematical journal
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• v.16 no.1
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• pp.97-103
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• 2000

In this work, we consider a finite difference operator $L^2_N$ corresponding to $$Lu:=-(u_{xx}+u_{yy})\;in\;{\Omega},\;u=0\;on\;{\partial}{\Omega}$$, in $S_{h^2,1}$. We derive the relation between the absolute value of the bilinear form $l_{N^2}$(u, v) on $S_{h^2,1}{\times}S_{h^2,1}$ and Sobolev $H^1$ norms.