The Euclidean space p2 is metric space . Specially R' (real line) R2( the complex plane) etc are metric .
Define d : "R^2 \u00d7 R^2 \u2192 R \\ by \\ d(x, y) = |x_1 \u2212 y_1| + |x_2 \u2212 y_2| x = (x_1,x_2), y = (y_1,y_2)" . Then d is a metric on "R^2" , called the "\u2113_1" metric. It is also referred to informally as the “taxicab” metric, since it's the distance one would travel by taxi on a rectangular grid of streets. , or maximum, metric.
"The \\ Euclidean \\ metric \\ is \\ the \\ function \\ d:R^n\u00d7R^n\\to R \\\\\\ that \\ assigns \\ to \\ any \\ two \\ vectors \\ in \\ Euclidean \\ n-space\\\\ \\ x=(x_1,...,x_n) \\ and \\ y=(y_1,...,y_n) \\ the \\ number \\ \\\\\n\n d(x,y)=\\sqrt{((x_1-y_1)^2+...+(x_n-y_n)^2)}, \\\\"
and so gives the "standard" distance between any two vectors in "R^n" .
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