知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。知乎凭借认真、专业. 非负性 同一性： d (x, y)=0 当且仅当 x = y 对称性： d (x, y)= d (y, x) 三角不等式： d (x, z)≤ d (x, y)+ d (y, z) 各向同性：对所有维度同等处理，无方向偏好 旋转不变性：坐标旋转不影响距离值.
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