 Euclidean distance

The distance between two points defined as the square root of the sum of the squares of the differences between the corresponding coordinates of the points; for example, in twodimensional Euclidean geometry, the Euclidean distance between two points a = (a<sub>x</sub>, a<sub>y</sub>) and b = (b<sub>x</sub>, b<sub>y</sub>) is defined as: : <math>d(\\textbf, \\textbf) = \\sqrt(\\textbf_x  \\textbf_x)^2 + (\\textbf_y  \\textbf_y)^2</math>
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