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 Oct28 awarded Tumbleweed Oct21 revised Maximization over linear surjective mapping of polyhedron Clarify the indices i and j. Oct21 asked Maximization over linear surjective mapping of polyhedron Sep24 awarded Autobiographer Sep18 awarded Popular Question Jul2 awarded Curious May3 revised Find $t$ which minimizes $\|A(x+ty)-b\|^2_2$ Changed b to \beta because b is already used. May3 revised Find $t$ which minimizes $\|A(x+ty)-b\|^2_2$ Changed b to \beta because b is already used. May3 answered Find $t$ which minimizes $\|A(x+ty)-b\|^2_2$ Jan22 awarded Popular Question Oct2 revised Maximum coordinate of a linear transformation of a vector added 222 characters in body Oct2 comment Maximum coordinate of a linear transformation of a vector @peterwhy Given $x$, there exists $\max(M x)$, and I want to bound it in terms of $M$ and $x$. For example, using the above bound, I can say that for all $x$ such that $\|x\|_\infty \leq \frac{\alpha}{\|M\|_\infty}$, $\max(M x) \leq \alpha$. But this bound is too conservative. Oct2 comment Maximum coordinate of a linear transformation of a vector $\|M\|_\infty$ is the induced infinity-norm for the matrix $M$. The last inequality is by definition. Oct2 asked Maximum coordinate of a linear transformation of a vector Oct4 awarded Yearling Sep20 asked Generalization of monotonicity and condition Jul17 accepted Closedness of sets under linear transformation Jul17 awarded Nice Question Jul16 comment Closedness of sets under linear transformation $X$ is never the whole space. It's the inverse image of $Y$ under linear operator $x \to C x$. Jul16 asked Closedness of sets under linear transformation