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 austinrochford.com
A Closed-form Solution for the Cholesky Decomposition of the Covariance Matrix of Exchangeable Normal Variables | Austin Roch...
| | www.ethanepperly.com
Low-Rank Approximation Toolbox: Nyström, Cholesky, and Schur - Ethan N. Epperly
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| | joellaity.com
Principal component analysis: pictures, code and proofs | Joel Laity
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| | The code used to generate the plots for this post can be found here.
| | www.raynergobran.com
Covariance Ellipses - Rayner Gobran
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| | To better understand covariance, I take a short trip down the rabbit hole to visit eigen vectors and return carrying a covariance ellipse!
| | dominiczypen.wordpress.com
Making critical graphs as regular as possible | Musings on general topology and orderings
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| Suppose you want to have a graph $latex G = (V,E)$ with chromatic number $latex \chi(G)$ equaling some value $latex k$, such that $latex G$ is minimal with this property. So you end up with a $latex k$-(vertex-)critical graph. It is easy to construct critical graphs by starting with some easy-to-verify example like $latex C_5$...