This site contains: mathematics courses and book; covers: image analysis, data analysis, and discrete modelling; provides: image analysis software. Created and run by Peter Saveliev.
Aka "taxicab metric"..
A special kind of metric or norm:
To find the distance between the vectors go along the grid
$$‖X - Y‖ = |X_1-Y_1|+|X_2-Y_2|.$$
Its circle is the square...
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