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距离是对两个物体或位置间相距多远的数值描述,是个不具方向性的标量,且不为负值。 在物理或日常使用中,距离可以是个物理长度,或某个估算值,指人、动物、交通工具或光线之类的媒介由起点至终点所经过的最短路径长。 在数学里,距离是个称之为度量的函数,为物理距离这个概念之推广。度量是个函数,依据一组特定的规则作用,且有具体的方法可用来描述一些空间内的元素互相“接近”或“远离”。除了欧氏空间内常见的距离定义外,在图论与统计学等数学领域里,亦存在其他的“距离”概念。在大多数的情形下,“从A至B的距离”与“从B至A的距离”的意义是相同的。
距离
Definition
距离是对两个物体或位置间相距多远的数值描述,是个不具方向性的标量,且不为负值。 在物理或日常使用中,距离可以是个物理长度,或某个估算值,指人、动物、交通工具或光线之类的媒介由起点至终点所经过的最短路径长。 在数学里,距离是个称之为度量的函数,为物理距离这个概念之推广。度量是个函数,依据一组特定的规则作用,且有具体的方法可用来描述一些空间内的元素互相“接近”或“远离”。除了欧氏空间内常见的距离定义外,在图论与统计学等数学领域里,亦存在其他的“距离”概念。在大多数的情形下,“从A至B的距离”与“从B至A的距离”的意义是相同的。
距离
距离
距离是对两个物体或位置间相距多远的数值描述,是个不具方向性的标量,且不为负值。 在物理或日常使用中,距离可以是个物理长度,或某个估算值,指人、动物、交通工具或光线之类的媒介由起点至终点所经过的最短路径长。 在数学里,距离是个称之为度量的函数,为物理距离这个概念之推广。度量是个函数,依据一组特定的规则作用,且有具体的方法可用来描述一些空间内的元素互相“接近”或“远离”。除了欧氏空间内常见的距离定义外,在图论与统计学等数学领域里,亦存在其他的“距离”概念。在大多数的情形下,“从A至B的距离”与“从B至A的距离”的意义是相同的。

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