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d ( V x , V y ) = ( f y 1 − f x 1 ) 2 + ( f y 2 − f x 2 ) 2 + ( f y 3 − f x 3 ) 2 {\displaystyle \mathrm {d} (\mathbf {V_{x}} ,\mathbf {V_{y}} )={\sqrt {(f_{y1}-f_{x1})^{2}+(f_{y2}-f_{x2})^{2}+(f_{y3}-f_{x3})^{2}}}}
d σ ( V x , V y ) = ( f y 1 − f x 1 ) 2 + ( f y 2 − f x 2 ) 2 + ( f y 3 − f x 3 ) 2 {\displaystyle \mathrm {d_{\sigma }} (\mathbf {V_{x}} ,\mathbf {V_{y}} )={\sqrt {(f_{y1}-f_{x1})^{2}+(f_{y2}-f_{x2})^{2}+(f_{y3}-f_{x3})^{2}}}}
