Questions tagged [convex-optimization]

A convex optimization problem consists of either minimizing a convex objective or maximizing a concave objective over a convex feasible region.

Convex Optimization is a special case of mathematical optimization where the feasible region is convex and the objective is to either minimize a convex function or maximize a concave function. Linear Programming is a special case. Convex Optimization problems as a class are easier to solve numerically than general mathematical optimization problems.

The following problems are all convex minimization problems, or can be transformed into convex minimizations problems via a change of variables:

  • Least squares
  • Linear programming
  • Convex quadratic minimization with linear constraints
  • Quadratic minimization with convex quadratic constraints
  • Conic optimization
  • Geometric programming
  • Second order cone programming
  • Semidefinite programming
  • Entropy maximization with appropriate constraints
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Testing for Convexity

Could somebody please explain the method for answering a question like this?
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Convex Functions with more than two terms

A convex function satisfies $f(tx+(1-t)y)\leq tf(x)+(1-t)f(y)$ for all $0\leq t\leq 1$. Then does this also imply that $$f(t_1x_1+t_2x_2+\cdots+ t_kx_k)\leq t_1f(x_1)+t_2f(x_2)+\cdots +t_kf(x_k)$$ whenever $\sum_i t_i=1$ with $t_1, t_2, \ldots,…
Andrew
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How to prove the following f(x) is convex function

Verify directly from the definition that the function of one variable f(x) = e^x is convex function. Prove two variables function :f(x1, x2) = x1^2 + 3x2^2 - 3x1x2 + 2x1 is convex
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How do I prove that this set is convex?

How do I prove that this set is convex? $S_2 = \{(x_1, x_2 ) : x_1x_2 ≥ 4, x_1 > 0, x_2 > 0\}$ I failed to prove that with {tx1 + (1 − t)x2 : 0 ≤ t ≤ 1}
mata
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question about optimization model

It seems pretty odd to change one of the variable when trying to do some optimization.
user774473
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Cost-benefit analysis

Let's say I have a set of data points which represents the cost and the benefit, for each data point. The entire curve is represented in the chart above by the solid blue line. What I am trying to figure out is which point on that solid blue line…
curious
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Prove inequality - Convex problem

Let $\{q_i\}_{i=1}^n$ be a sequence such that $0\le q_1\le q_2\le \cdots\le q_n$. How can I prove that $$\sum_{i=1}^n q_is_i\le q_n,$$ where $\sum\limits_{i=1}^n s_i = 1$ for all $s_i\ge 0$?
Alex
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