• 대한수학회논문집
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• 제23권1호
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• pp.41-47
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• 2008

The notions of mote, beam and osculatory WFI-algebra are introduced, and several properties are investigated. Relations between osculatory WFI-algebra and associative WFI-algebra are provided. Characterizations of osculatory WFI-algebra are given.

• 대한수학회보
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• 제20권2호
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• pp.71-74
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• 1983

The problems of the continuity of homomorphisms between Banach algebras have been studied widely for the last two decades to obtain various fruitful results, yet it is far from characterizing the calss of Banach algebras for which each homomorphism from a member of the class into a Banach algebra is conitnuous. For commutative Banach algebras A and B a simple proof shows that every homomorphism .theta. from A into B is continuous provided that B is semi-simple, however, with a non semi-simple Banach algebra B examples of discontinuous homomorphisms from C(K) into B have been constructed by Dales [6] and Esterle [7]. For non commutative Banach algebras the problems of automatic continuity of homomorphisms seem to be much more difficult. Many positive results and open questions related to this subject may be found in [1], [3], [5] and [8], in particular most recent development can be found in the Lecture Note which contains [1]. It is well-known that a$^{*}$-isomorphism from a $C^{*}$-algebra into another $C^{*}$-algebra is an isometry, and an isomorphism of a Banach algebra into a $C^{*}$-algebra with self-adjoint range is continuous. But a$^{*}$-isomorphism from a $C^{*}$-algebra into an involutive Banach algebra is norm increasing [9], and one can not expect each of such isomorphisms to be continuous. In this note we discuss an isomorphism from a commutative $C^{*}$-algebra into a commutative Banach algebra with dense range via separating space. It is shown that such an isomorphism .theta. : A.rarw.B is conitnuous and maps A onto B is B is semi-simple, discontinuous if B is not semi-simple.

• 대한수학교육학회지:학교수학
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• 제5권3호
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• pp.343-360
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• 2003

초등수학에서 중등수학으로의 이행에서 대수는 중요한 역할을 한다. 그리고 학교수학에서 어떻게 대수를 도입하는가 하는 문제는 중등수학 전반에서 그 성공여부를 결정짓는 중요한 요소가 된다. 일반적으로 학교대수는 대수 기호를 형식적으로 도입하는 전통적인 접근법을 따르고 있다. 이것은 대수를 일반화된 산술이라는 관점에서 보는 것으로, 여기서 문제는 이러한 접근법에서 학생들이 많은 어려움을 경험한다는데 있다. 따라서 이 글은 이러한 어려움을 해결하기 위한 하나의 대안으로 형식적인 대수 지도 방법을 대신하여 패턴과 일반화 측면을 강조하여 대수를 지도하는 방법에 대해 살펴보고자 한다. 이것은 대수를 도입하는 다양한 관점 곧, 문제해결과 모델링, 일반화된 산술을 비롯하여 함수를 포함하며, 동시에 대수에 내재된 패턴을 통해 대수학습에서 핵심으로 다루어지는 일반화라는 사고 양식을 이끌어내기 위한 것이다. 이를 위해 이 글은 먼저 대수와 패턴, 일반화 사이의 관계를 살펴보고, 그리고 패턴과 일반화를 강조한 대수 접근법이 대수 수업의 실제에서 어떻게 제시될 수 있는가에 대해 살펴볼 것이다.

• 호남수학학술지
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• 제27권4호
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• pp.571-581
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• 2005

The Weyl-type non-associative algebra ${\overline{WN_{g_n,m,s_r}}$ and its subalgebra ${\overline{WN_{n,m,s_r}}$ are defined and studied in the papers [8], [9], [10], [12]. We will prove that the Weyl-type non-associative algebra ${\overline{WN_{n,0,0_{[2]}}}$ and its corresponding semi-Lie algebra are simple. We find the non-associative algebra automorphism group $Aut_{non}({\overline{WN_{1,0,0_{[2]}}})$.

• 호남수학학술지
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• 제38권2호
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• pp.269-277
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• 2016

In a paper of S. H. Choi [2], the author studied the derivations of a restricted Weyl Type non-associative algebra, and determined a 1-dimensional vector space of derivations. We describe all the derivations of this algebra and prove that they form a 3-dimensional Lie algebra.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 1998년도 The Third Asian Fuzzy Systems Symposium
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• pp.522-525
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• 1998

Although each de Morgan algebra has not always fixed points(centers), it has always fixed cores, the natural extention of fixed points. Fixed cores, of they do not degenerate to fixed points, are Boolean algebras, It is also shown the necessary and sufficient condition a algebra to be a Kleene algebra(fuzzy algebra) is that it has just one fixed core.

• Journal of applied mathematics & informatics
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• 제31권3_4호
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• pp.559-564
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• 2013

In this paper we investigate necessary conditions for the mirror algebra $(M(X),{\bigoplus},(0,0))$ to be a $d$-algebra (having the condition (D5), resp.) when (X, *, 0) is a d-algebra (having the condition (D5), resp.). Moreover, we obtain the necessary conditions for M(X) of a $d^*$-algebra X to be a $d^*$-algebra.

• 대한수학회지
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• 제33권4호
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• pp.1123-1128
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• 1996

Let A be an (nonassociative) algebra with multiplication xy over a field F, and denote by $A^-$ the algebra with multiplication [x, y] = xy - yx$ defined on the vector space A. If $A^-$ is a Lie algebra, then A is called Lie-admissible. Lie-admissible algebras arise in various topics, including geometry of invariant affine connections on Lie groups and classical and quantum mechanics(see [2, 5, 6, 7] and references therein).

• 대한수학회보
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• 제55권6호
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• pp.1727-1748
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• 2018

In this paper, we characterize the graded post-Lie algebra structures on the W-algebra W(2, 2). Furthermore, as applications, the homogeneous Rota-Baxter operators on W(2, 2) and solutions of the formal classical Yang-Baxter equation on $W(2,2){\ltimes}_{ad^*} W(2,2)^*$ are studied.

• 대한수학회보
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• 제36권3호
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• pp.503-512
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• 1999

Over a field k, every schur k-algebra is a cyclotomic algebra due to Brauer-Witt theorem. Similarly every projective Schur k-division algebra is itself a radical algebra by Aljadeff-Sonn theorem. We study the two theorems over a certain commutative ring, and prove similar results over regular domain containing a field.