Squeeze Mapping

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In linear algebra, a squeeze mapping is a type of linear map that preserves Euclidean area of regions in the Cartesian plane, but is not a Euclidean motion. For a fixed positive real number r, the mapping (x,y) (r x, y / r ) is the squeeze mapping with parameter r. Since {(u,v) : u v = mathrm{constant}} is a hyperbola, if u = r x and v = y / r, then uv = xy and the points of the image of the squeeze mapping are on the same hyperbola as (x,y) is. For this reason it is natural to think of the squeeze mapping as a hyperbolic rotation, as did Émile Borel in 1913.