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Operations research, linear programming, control theory, systems theory, optimal control, game theory
1
vote
0
answers
61
views
An “almost separable” optimization problem on a graph
I am trying to solve an unconstrained optimization problem with the following properties: I am given a graph $G=(V,E)$ with functions $f_{ij}:\mathbb{R}^2\to \mathbb{R}$ for each edge $(i,j)$. I am tr …
3
votes
2
answers
98
views
Expected minimum of a linear function on the unit cube
Let $c\in\mathbb{R}^n$ and let $X_1,X_2$ be two independent uniform samples on the unit cube in $\mathbb{R}^n$. Is there anything at all (in an analytic sense) we can say about the expectation $E\min …
1
vote
0
answers
24
views
Simple monotonicity property for coordinate descent and linear objective functions
Let $S \subset \mathbb{R}^n$ satisfy $0\leq x_1\leq\dots\leq x_n$ for all $\mathbf{x}\in S$, among other (possibly nonconvex) constraints, and suppose in addition that $\sum_{i=1}^n x_i \geq 1$ for al …
4
votes
1
answer
878
views
Basic result in semi-infinite linear programming
Consider a standard linear program of the form $$\textrm{minimize}_x~~~~ c^Tx~~~~ s.t. \\ Ax = b \\ x \geq 0$$ with $x\in \mathbb{R}^n$ and $A \in \mathbb{R}^{m \times n}$. It is well known that, if …
6
votes
2
answers
315
views
Convex optimization with full subdifferential information
Can anyone direct me to any algorithms or theorems that describe the difficulty of solving a non-smooth convex optimization problem for the special case where the full subdifferential is available? A …
1
vote
2
answers
333
views
The term for problems "like" Brachistocrone?
Is there a commonly-accepted umbrella term for infinite-dimensional calculus problems where the goal is to compute an optimal geometric path between a pair of points? Three examples of this would be …
6
votes
1
answer
344
views
The Euclidean norm and $k$ largest elements
This is not a homework problem, although I fear it may turn out to be at that level. For any nonnegative $x\in\mathbb{R}^n$, let $f_k(x)$ be the sum of the $k$ largest values in $x$, and define $$f(x …
13
votes
3
answers
828
views
Famous theorems that are special cases of linear programming (or convex) duality
The max flow-min cut theorem is one of the most famous theorems of discrete optimization, although it is very straightforward to prove using duality theory from linear programming. Are there any othe …
2
votes
1
answer
123
views
Functions that are easy to compare to a norm
Let $X$ be a subset of $\mathbb{R}^d$, let $\|\cdot \|_p$ be a norm with $1\leq p\leq\infty$, and let $f:\mathbb{R}^d\to\mathbb{R}$ be a function. I'm trying to find examples of $X$, $p$, and $f$ for …
3
votes
0
answers
100
views
Optimally placing rectangles with obstacles
I am struggling with a fairly simple and natural geometric optimization problem, but I have not been able to find an obvious canonical method for solving it:
I am given a collection of $m$ axis-align …
6
votes
2
answers
334
views
Do computational geometers use Lagrange multipliers?
Can anyone point me to an example of a problem that (more or less) originated in computational geometry whose solution requires the use of Lagrange multipliers (or Kuhn-Tucker conditions, or dual vari …
5
votes
0
answers
96
views
Non-convex optimization problem involving minimum spanning trees
Suppose I am given $n$ points $p_1,\dots,p_n\in \mathbb{R}^2$, as well as two positive coefficients $a_1$ and $a_2$, and I am trying to select $n$ points $x_1,\dots,x_n$ to solve the following optimiz …
6
votes
3
answers
311
views
A path in the unit square that "doubles back" on itself in a nice way
Given a path $P$ in the unit square, and two points $p_{1},p_{2}$
located on $P$, let $d_{P}(p_{1},p_{2})$ denote the distance from
$p_{1}$ to $p_{2}$ traversed along $P$. Given $a>1$, I am looking
f …
10
votes
1
answer
334
views
How can a Roomba turn as little as possible?
Suppose I have a convex polygon $C$ and a radius $r>0$, and I seek a path $P$ that "covers" $C$, in the sense that any point $C$ is within distance $r$ of $P$: $$d(x,P)\leq r~\forall x\in C~,$$
where …
12
votes
1
answer
211
views
The angles subtended in a TSP tour
If I sample a large number of uniform points in the unit square and take a traveling salesman tour of them, is there anything at all that can be said/is known about the distribution of angles at each …