共查询到19条相似文献，搜索用时 125 毫秒
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本文在加法范畴上定义了Koethe根，给出了它的模刻划，通过引进（幂零元）左Zorn条件得到加法范畴上Koethe猜测成立的充要条件，进而得到加法范畴上Herstein猜测成立的充要条件，同时得到环论中相应的结果和两个猜测成立的充要条件，这个条件较[2] 条件有一定的减弱。 相似文献
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洪平洲 《赣南师范学院学报》1991,(Z2)
本文在结合环中引进了特殊左零化子集极大元条件,讨论了具这条件之环的性质,研究了环的BAER根、Levitzki根及Kothe根彼此间相等与幂零的充要条件,同时还给出了环的幂零根存在的充要条件。 相似文献
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本文[1]中我们引进了DQrC一环的定义并给了Kothe根以及Noether DQrC一环的理想准质分解为一些刻划,本文将给出交换环中著名Krull交定理在DQrC一环巾的推广。 相似文献
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首先给出了加法范畴的Abel化与幂等完备化的关系,证明了加法范畴的幂等完备化范畴是其Abel化范畴的投射子范畴;在此基础上,证明了三角范畴recollement的Abel化是Abel范畴的右recollement。 相似文献
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考虑加法范畴的推出范畴的幂等完备化与加法范畴幂等完备化的推出范畴的关系,进一步证明了Abel范畴的推出范畴的幂等完备化与Abel范畴幂等完备化的推出范畴等价。 相似文献
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讨论了加法范畴中Noble型分块态射m=[ab bd]的Moore-Penrose逆,且给出了Moore-Penrose逆的表达式. 相似文献
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1．让学生在具体情景中进一步理解加法的意义，初步学会看一幅图可以列两道加法算式，体会两道相应加法算式之间的联系。 相似文献
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Ceneida Fernández Salvador Llinares Wim Van Dooren Dirk De Bock Lieven Verschaffel 《European Journal of Psychology of Education - EJPE》2012,27(3):421-438
This study investigates the development of proportional and additive methods along primary and secondary school. In particular, it simultaneously investigates the use of additive methods in proportional word problems and the use of proportional methods in additive word problems. We have also studied the role played by integer and non-integer relationships between the given numbers and the nature of quantities (discrete or continuous) in the development of these phenomena. A test consisting of additive and proportional missing-value word problems was solved by 755 primary and secondary school students (from fourth to tenth grade). The findings indicate that the use of additive methods in proportional situations increased during primary school and decreased during secondary school, whereas the use of proportional methods in additive situations increased along primary and secondary school. Moreover, the presence or absence of integer ratios strongly affects this behavior, but the nature of quantities only has a small influence on the use of proportional methods. 相似文献
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任芳 《福建工程学院学报》2012,10(6):529-532,587
证明任意半环上的半模范畴是加性regular范畴,并给出半模的函子表示。证明了加性regular范畴关于伴随对的左右平凡扩张范畴是同构的。最后应用至半模范畴,得到半环S的半模范畴S-S Mod关于Hom函子Homs（M,）的左平凡扩张范畴HomS（M,）∝S-SMod和S-SMod关于张量函子M×S-的右平凡扩张范畴S-SMod∝×S-是范畴等价。 相似文献
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研究了广义系统的正实控制问题.在控制器增益摄动具有加法和乘法两种形式下,讨论了广义系统的严格正实弹性控制器的设计问题,给出了严格正实弹性控制器存在的充分条件. 相似文献
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证明了关于在限制域上近似可加映射的Hyers-Ulam稳定性的一个结果,推广了F.Skof的相应定理。同时,得到结果的两个应用。特别获得了过零映射成为可加映射的一个充分必要条件。 相似文献
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研究了语言判断矩阵的加性一致性及方案排序问题.在给出有关语言判断矩阵和模糊互补判断矩阵的概念的基础上,提出语言判断矩阵的加性一致性的定义,然后通过引进导出矩阵将语言判断矩阵转换为数值判断矩阵.通过判定现有的数值判断矩阵的一致性方法.对导出矩阵进行一致性判断,得到给予语言判断矩阵的一致性的判定方法,最后通过一个算例说明文中提出的分析方法. 相似文献
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利用深度萃取脱油方法制备的高软化点硬沥青材料, 通过熔融共混的方法对聚苯乙烯进行添加改性, 并通过高压渗透发泡剂的方法进行预发泡处理, 对蒸汽发泡后的泡沫聚苯乙烯进行了压缩强度, 吸水性, 发泡倍率等表征, 结果表明硬沥青的添加不会对材料的发泡性能产生影响, 但压缩强度会有所降低。 相似文献
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Tine Degrande Lieven Verschaffel Wim Van Dooren 《European Journal of Psychology of Education - EJPE》2018,33(4):559-576
While previous studies mainly focused on children’s additive and multiplicative reasoning abilities, we studied third to sixth graders’ preference for additive or multiplicative relations. This was investigated by means of schematic problems that were open to both types of relations, namely arrow schemes containing three given numbers and a fourth missing one. In study 1, children had to fill out the missing number, while in study 2, children had to indicate all possibly correct answers among a set of given alternatives. Both studies explicitly showed the existence of a preference for additive relations in some children, while others preferred multiplicative relations. Mainly younger children preferred additive relations, whereas mainly children in upper primary education preferred multiplicative relations. Number ratios also impacted children’s preference, especially in fifth grade. Moreover, the results of study 2 provided evidence for the strength of children’s preference and showed that calculation skills do not coincide with preference, and hence, that preference and calculation skills are two distinct child characteristics. The results of both studies using these open problems resembled previous research results using classical multiplicative or additive word problems. This supports the hypothesis that children’s preferred type of relations may be at play in solving classical word problems as well—besides their abilities—and may hence be an additional factor explaining the mistakes that children make in those word problems. This research line thus seems promising for further research as well as educational practice. 相似文献
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《Structural equation modeling》2013,20(2):219-250
The article gives alternatives to Campbell and O'Connell's (1967) definitions of additive and multiplicative method effects in multitrait-multimethod (MTMM) data. The alternative definitions can be formulated by means of constraints in the parameters of the correlated uniqueness (CU) model (Marsh, 1989), which is first reviewed. The definitions have 2 major advantages. First, they allow the researcher to test for additive and multiplicative method effects in a straightforward manner by simply testing the appropriate constraints. An illustration of these tests is given. Second, the alternative definitions are closely linked to other currently used models. The article shows that CU models with additive constraints are equivalent to constrained versions of the confirmatory factor analysis model for MTMM data (Althauser, Heberlein, & Scott, 1971; Werts & Linn, 1970). In addition, Coenders and Saris (1998) showed that, for designs with 3 methods, a CU model with multiplicative constraints is equivalent to the direct product model (Browne, 1984). 相似文献
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研究一类具有匹配不确定性,且状态及输出都有多时滞的广义系统的非脆弱鲁棒H∞控制．文中主要用LMI方法和积分不等式,获得系统的非脆弱鲁棒H∞控制器使闭环系统渐近稳定,且满足H∞性能的约束条件γ的时滞相关条件．给出具有加法不确定性控制器的设计方法． 相似文献