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 Jan 19 comment Simple question about $\nabla f(\mathbf x).(\mathbf y - \mathbf x)$ Yes, I am looking for something that is simple to describe to someone with little background in math. Jan 19 asked Simple question about $\nabla f(\mathbf x).(\mathbf y - \mathbf x)$ Jul 2 awarded Curious Jun 26 accepted Dimension reduction over finite fields Jun 26 comment Dimension reduction over finite fields Yes, it's fixed. Jun 26 asked Dimension reduction over finite fields Jun 17 awarded Popular Question Jun 15 comment Reducing the number of rows in a matrix without loosing the rank @GerryMyerson: Thank you, I think your comment is an acceptable answer. Jun 12 comment Reducing the number of rows in a matrix without loosing the rank @GerryMyerson: I think my question, as I asked it above, is clear. I am looking for a matrix $T$ as described in the question that works for any $A$. Jun 12 comment Reducing the number of rows in a matrix without loosing the rank @GerryMyerson: Your are right, but my question is a special case of a more general problem. The general problem is so that your solution cannot be used for that. Jun 12 comment Reducing the number of rows in a matrix without loosing the rank @David: Yes, if possible. Jun 12 asked Reducing the number of rows in a matrix without loosing the rank Jun 6 awarded Good Question May 11 asked Generalization of xy plane in 3D space Apr 30 answered Creating a matrix such that all the sub-matrices are max rank Apr 30 asked Creating a matrix such that all the sub-matrices are max rank Apr 11 asked Finding the value of a linear combination out of a system of equations Mar 14 revised Showing that a logarithmic inequality holds added 4 characters in body Mar 14 revised Showing that a logarithmic inequality holds edited title Mar 14 revised Showing that a logarithmic inequality holds edited tags