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  • 0 posts edited
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  • 6 votes cast
Oct
28
awarded  Tumbleweed
Oct
21
revised Maximization over linear surjective mapping of polyhedron
Clarify the indices i and j.
Oct
21
asked Maximization over linear surjective mapping of polyhedron
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