Non-negativity Identity: d (x, y)=0 if and only if x = y Symmetry: d (x, y)= d (y, x) Triangle inequality: d (x, z)≤ d (x, y)+ d (y, z) Isotropy: all dimensions are treated equally, no direction preference Rotation invariance: coordinate rotation does not affect distance values. Zhihu, a high-quality Q&A community on the Chinese Internet and an original content platform where creators gather, was officially launched in January 2011 with the brand mission of "allowing people to better share knowledge, experience and insights, and find their own answers." Zhihu relies on seriousness and professionalism. Zhihu, a high-quality Q&A community on the Chinese Internet and an original content platform where creators gather, was officially launched in January 2011 with the brand mission of "allowing people to better share knowledge, experience and insights, and find their own answers." Zhihu relies on seriousness and professionalism.
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Words starting with Y include: yearn, yellow, yen, yesterday, yoga, you, young, yacht n. Yacht, speedboat, yak plow ox, yam n.
