Approaching functions: Cabri tools as instruments of semiotic mediation     

Rossana Falcade  Colette Laborde  Maria Alessandra Mariotti 《Educational Studies in Mathematics》2007,66(3):317-333

Assuming that dynamic features of Dynamic Geometry Software may provide a basic representation of both variation and functional dependency, and taking the Vygotskian perspective of semiotic mediation, a teaching experiment was designed with the aim of introducing students to the idea of function. This paper focuses on the use of the Trace tool and its potentialities for constructing the meaning of function. In particular, starting from a dynamic approach aimed at grounding the meaning of function in the experience of covariation, the Trace tool can be used to introduce the twofold meaning of trajectory, at the same time global and pointwise, and leads students to grasp the notion of function.  相似文献   

关于方程(~mu)/(t~m)=Lu的Cauchy问题     

杨志林 《怀化学院学报》1994,(6)

本文讨论抽象Cauchy问题,并把它应用于积分一偏微分方程的Cauchy问题,得到了有趣的结果.  相似文献   

Family favoritism: Defining a communication-oriented construct     

Jimmie Manning  Andrea Lambert South 《Qualitative Research Reports in Communication》2018,19(1):18-24

This study draws from 98 participant interviews to develop an empirical definition of family favoritism. Results indicate that study participants understand favoritism as a consistent, sometimes situational parental demonstration of preferential treatment toward a particular child, especially in consideration of attention, resources, and affection. Considering a communication as constitutive of reality perspective in conjunction with the definition helps to illuminate the communicative nature of favoritism, especially as participants recognize how attention and affection are communicated and resources are offered. The results of this study suggest that communication is constitutive of favoritism, and further studies should consider communication’s centrality in familial favoritism.  相似文献   

Hermite多项式的两种微分表示之恒等性的证明     

朱洪玉 《内江师范学院学报》2003,18(4):20-22

用两种方法证明了Hermite多项式的两种微分表示是恒等的。  相似文献   

中立型时滞双曲微分方程的振动准则     

段惠  林诗仲 《海南师范学院学报》2007,20(3):197-200,205

建立了一类中立型非线性时滞双曲微分方程的若干新的振动准则,结论推广和改进了一些文献中的定理．  相似文献   

一类被m次积分解类所刻画的控制系统解集合的研究     

龙飞  刘华云 《贵州教育学院学报》2002,13(4):1-4

引入了一类被m次积分解类所刻画的控制系统的近似可控性概念，并获得了这类控制系统近似可控性的一个充要条件。  相似文献   

辅助函数构造的一种新途径     

朱石焕  宋福庆 《安阳师范学院学报》2004,(2):5-6

本文借助于常微分方程理论,给出微分中值应用时引入辅助函数的新方法.  相似文献   

直觉思维在几何论证中的作用     

赵成秀 《铜仁学院学报》2003,5(Z1):108

在几何论证中,不仅演绎推理是重要的,直觉思维亦起着微妙而重要的作用.  相似文献   

二阶非线性常微分方程的转化问题     

李兵方 《安康学院学报》2007,19(4):72-73,83

借助变换、交换变量位置等方法,可以把两类二阶非线性常微分方程转化为二阶常系数线性常微分方程,得到二阶非线性常微分方程的可积判据及其通积分,达到了拓宽其应用范围的目的.  相似文献   

关于《微分中值定理中间点的渐近性》一文的注记     

卞文进 《临沂师范学院学报》1997,(6)

指出了《微分中值定理中间点的渐近性》一文的错误 ,并给出了相应的正确结论  相似文献