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 Oct 28 awarded Tumbleweed Sep 24 awarded Autobiographer Sep 18 awarded Popular Question Jul 2 awarded Curious May 3 revised Find $t$ which minimizes $\|A(x+ty)-b\|^2_2$ Changed b to \beta because b is already used. May 3 revised Find $t$ which minimizes $\|A(x+ty)-b\|^2_2$ Changed b to \beta because b is already used. May 3 answered Find $t$ which minimizes $\|A(x+ty)-b\|^2_2$ Jan 22 awarded Popular Question Oct 2 revised Maximum coordinate of a linear transformation of a vector added 222 characters in body Oct 2 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. Oct 2 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. Oct 2 asked Maximum coordinate of a linear transformation of a vector Oct 4 awarded Yearling Sep 20 asked Generalization of monotonicity and condition Jul 17 accepted Closedness of sets under linear transformation Jul 17 awarded Nice Question Jul 16 comment Closedness of sets under linear transformation $X$ is never the whole space. It's the inverse image of $Y$ under linear operator $x \to C x$. Jul 16 asked Closedness of sets under linear transformation Jul 10 asked When are attracting sets invariant? Jun 6 awarded Commentator