02_006_Vector_space_Euclid_space_Distance_between_2_vectors_in_Euclidian_distance.html
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There are many kinds in vector space
You will deal with Euclid space
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Distance between 2 vectors as Euclidian distance
$$$d_{E}(x,y) = |x-y|=||x-y||=\sqrt{\sum\limits_{k=1}^{d}(x_{k}-y_{k})^{2}}$$$
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