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首页> 外文期刊>Jahresbericht der Deutschen Mathematiker-Vereinigung >On Sign Preservation for Clotheslines, Curtain Rods, Elastic Membranes and Thin Plates
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On Sign Preservation for Clotheslines, Curtain Rods, Elastic Membranes and Thin Plates

机译:晾衣绳,窗帘杆,弹性膜和薄板的标志保存

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摘要

All problems mentioned in the title seem to have one thing in common. Whenever a force is applied in one direction, the object moves in that direction. At least this is what one might expect. The corresponding boundary value problems contain differential equations of second order for line and membrane, while rod, or beam, and plate are modeled through fourth order differential equations. How a positive source will give a positive solution crucially depends on this order and the boundary conditions. We will present a survey concerning the so-called positivity preserving property for these various models.
机译:标题中提到的所有问题似乎都有共同点。只要在一个方向上施加力,对象就会在该方向上移动。至少这是人们可能期望的。相应的边界值问题包含线和膜的二阶微分方程,而杆,梁,板的四阶微分方程则被建模。积极来源如何给出积极解决方案至关重要地取决于这个顺序和边界条件。我们将针对这些各种模型提出一项关于所谓的阳性保存特性的调查。

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