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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