论直线与光和时空的关系

本文通过对直线的数学定义进行考查，得出欧几里德几何中的直线在客观世界中是不存在的，我们头脑中的直线只是对光线的反映和感性认识。然后论述了直线与光和时空的关系，由于光因弓I力而发生偏转，时空因物质的存在而产生弯曲，我们头脑中的直线并不是直的。最后，基于自然界的弯曲时空比欧几里德几何中的平坦时空要复杂得多，我们利用测地线的概念重新对直线下了一个更广泛的定义，即：直线是存在于某一时空里两点之间的光最短路径。

With researches on the mathematical definition of straight line, this article concluded that the straight line in Euclidean geometry does not exist in our world. The straight line in our minds was just the reflection on light. The relationship between straight line and light, space-time is analyzed. Light is deflected with the influence of gravitational force, and the spacetime is curved because of matt are not straight er, B so the straight lines in our minds ecause the curved space in nature is more complicated than the flat space in Euclidean geometry, we proposed a general definition of straight lines based on concept of geodesic： straight line is the shortest path between two points in some space