Fixed edge-length graph drawing is NP-hard
Discrete Applied Mathematics
Nonlinear optimization: complexity issues
Nonlinear optimization: complexity issues
Coin graphs, polyhedra, and conformal mapping
Proceedings of the 2nd Slovenian conference on Algebraic and topological methods in graph theory
New results in the packing of equal circles in a square
Discrete Mathematics
Approximation schemes for covering and packing problems in image processing and VLSI
Journal of the ACM (JACM)
Journal of Optimization Theory and Applications
Computers and Intractability: A Guide to the Theory of NP-Completeness
Computers and Intractability: A Guide to the Theory of NP-Completeness
Packing equal circles in a square: a deterministic global optimization approach
Discrete Applied Mathematics
On the Complexity of Recognizing Intersection and Touching Graphs of Disks
GD '95 Proceedings of the Symposium on Graph Drawing
Approximate algorithms for constrained circular cutting problems
Computers and Operations Research
Generating optimal T-shape cutting patterns for circular blanks
Computers and Operations Research
Mathematical Programming: Series A and B
Deterministic Global Optimization: Theory, Methods and (NONCONVEX OPTIMIZATION AND ITS APPLICATIONS Volume 37) (Nonconvex Optimization and Its Applications)
New Approaches to Circle Packing in a Square: With Program Codes (Springer Optimization and Its Applications)
Automatic Generation of Symmetry-Breaking Constraints
COCOA 2008 Proceedings of the 2nd international conference on Combinatorial Optimization and Applications
Branching and bounds tighteningtechniques for non-convex MINLP
Optimization Methods & Software - GLOBAL OPTIMIZATION
Solving the problem of packing equal and unequal circles in a circular container
Journal of Global Optimization
Feasibility-based bounds tightening via fixed points
COCOA'10 Proceedings of the 4th international conference on Combinatorial optimization and applications - Volume Part I
Reformulations in mathematical programming: automatic symmetry detection and exploitation
Mathematical Programming: Series A and B
Greedy vacancy search algorithm for packing equal circles in a square
Operations Research Letters
GloMIQO: Global mixed-integer quadratic optimizer
Journal of Global Optimization
Valid constraints for the Point Packing in a Square problem
Discrete Applied Mathematics
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We study the problem of packing equal circles in a square from the mathematical programming point of view. We discuss different formulations, we analyze formulation symmetries, we propose some symmetry breaking constraints and show that not only do they tighten the convex relaxation bound, but they also ease the task of local NLP solution algorithms in finding feasible solutions. We solve the problem by means of a standard spatial Branch-and-Bound implementation, and show that our formulation improvements allow the algorithm to find very good solutions at the root node.