# All Questions

390 questions
Filter by
Sorted by
Tagged with
2 views

### Are fuzzy sets appreciated by OR community?

I may not be correct but it seems that the leading operations research and management science journals (Informs OR and MS) do not publish any works on fuzzy logic or fuzzy sets. I could find only ...
13 views

### Difficulties with finding equivalent problem on literature

I'm working with a sort of pickup delivery problem right now. We need to assign vehicles to routes and requests to those vehicles. Each request has its due date, client and may be delivered in one of ...
25 views

### CVRP With Variable Fleet Size: Upper Bound on Optimal Fleet Size

Given a CVRP where the number of trucks is a decision variable, is there an upper bound on the number of trucks used in an optimal solution in terms of number of customers, some distances, capacities, ...
87 views

### Excel Solver linear programming - Is it possible to use average of values as a constraint without #DIV/0! errors or sacrificing linearity?

I'm trying to create an assignment optimization model where the areas are assigned to either the south or north school districts so that the total distance is minimized. Each school must have at least ...
29 views

1k views

### Number of aircraft to operate in an airline company

Suppose that an airline company has X planes, in general the companies keep a number of these aircraft (say 80% of X) in reserve in case of hazards. My question is how the airline companies compute ...
532 views

### How to progress with CPLEX/Gurobi

I've been learning and playing with CPLEX/Gurobi for a year using C++/Python API. I know some basic stuff like writing a model, callbacks, basic playing with solvers' parameters. I am wondering what ...
413 views

### Online Education for OR and Developing Decision Support Systems

I am looking for educational programmes which can be conducted online, such as full MSc., degree certificates, postgraduate courses/modules, MOOCs. Topics I am looking for are on advanced ...
125 views

### Valid Inequalities and Strong Inequalities

Consider the following mixed-integer set: P(A, b ; S) \stackrel{\text { def }}{=}\left\{x \in \mathbb{R}^{n} : A x \leq b, x_{j} \in \mathbb{Z} \text { for } j \in S\right\} \end{...
4k views

### Are programming languages necessary/useful for operations research practitioner?

This semester I will start teaching Programming in Python to Master students in Supply Chain Management. I would like to start the first lesson with "Why learning programming languages will be useful ...
131 views

### Convex vs Strictly Quasiconvex Functions in Optimization

I have read/heard quite a few time that in the old days, it was considered that linear programs constitute the class of optimization problems that can be solved efficiently in practice (as a rule of ...
35 views

### how to identify hard and soft constraint [duplicate]

I was being asked few questions on hard and soft constraints in an interview. Question 1. Which among following questions are hard or soft constraint ? Question 2. In these examples, How to convert ...