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| | How do you determine if four points make a square?
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| | I have had to manipulate a lot of images in my life to look nice with brands where no designer was available to do the job. I wanted an algorithm to make this easier for a long time, and recently I...
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| | The Ultimate GCSE Foundation Maths Revision Video and Booklet - Edexcel AQA OCR - Corbettmaths
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| A Householder matrix is an $latex n\times n$ orthogonal matrix of the form $latex \notag P = I - \displaystyle\frac{2}{v^Tv} vv^T, \qquad 0 \ne v \in\mathbb{R}^n. $ It is easily verified that $LATEX P$ is orthogonal ($LATEX P^TP = I$), symmetric ($LATEX P^T = P$), involutory ($LATEX P^2 = I$ that is, $LATEX P$ is...