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Questions about the properties of vector spaces and linear transformations, including linear systems in general.

0 votes
0 answers
64 views

Probability of collision of sums of vectors

Let $S_1$ and $S_2$ be sets of vectors from $\mathbb{R}^d$ that are distinct and let $\sigma(\cdot)$ be a non-linearity, e.g., a componentwise sigmoid function. Does there exist a random matrix $R \i …
Christopher's user avatar
1 vote
1 answer
90 views

Probability of collision of sums of vectors multiplied by random matrix

Let $S$ and $T$ be sets of vectors from $\mathbb{R}^d$ such that $S$ and $T$ are at least different in one element. Does there exist a random matrix $M \in \mathbb{R}^{d \times k}$, e.g., a gaussian …
Christopher's user avatar
5 votes
1 answer
384 views

Examples of Polyhedra with Large Shadows

Let $P \subseteq \mathbb{R}^n$ be a polyhedron described by $\mathcal{O}(n^{c_1})$ inequalities, where $c_1$ is a constant. Moreover, let $M\colon P \to \mathbb{R}^2$ be a linear mapping. I'm looking …
Christopher's user avatar
4 votes
1 answer
692 views

$\mathcal{H}$-polyhedron under a linear map

Let $P = \{ x \in \mathbb{R}^n \mid Ax \leq b \}$ be a (bounded) polyhedron for $A \in \mathbb{R}^{m \times n}$ and $b \in \mathbb{R}^m$, $n,m > 0$. Moreover, let $M \colon \mathbb{R}^n \to \mathbb{R …
Christopher's user avatar