单词	unit square
释义	unit square A square of side 1 unit, specifically the unit square defined by O(0,0), I(1,0), K(1,1), J(0,1). It can be used to identify the linear map from a matrix or find the matrix if the linear map is known because the images of points I and J form the columns of the matrix which performs that transformation. For example, in a rotation of 90° clockwise (about the origin), the image of I is (0,−1) and the image of J is (1,0) so the matrix is . If a matrix of a transformation is then the image of I is just the first column, i.e. (1,0), so it has not moved, and the image of J is (3,1), so the transformation is a shear parallel to the x-axis which moves (0,1) to (3,1).
随便看	validation Vallée-Poussin, Charles-Jean de la value value Vandermonde's convolution formula Vandermonde's determinant Van der Waerden's Theorem vanish Var variability variable variance variance, analysis of variation varies directly variety vector vector analysis vector bundle vector equation vector equation vector field vector norm vector potential vector product

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