16 problems
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Mixed-integer centerpoint conjecture
Let be a compact, convex set and let . For , define its mixed-integer volume by … with counti…
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Oracle-query lower bound for mixed-integer convex optimization
Mixed-integer oracle lower-bound conjecture. Under these assumptions, at least
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The typical-oracle conjecture on tail-off convergence in Benders decomposition
Let denote the continuous Benders relaxation, and let and denote the sequential and branch-and-Benders implementations, re…
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Runtime conjecture for MINLP optimization of redundant neural networks
Runtime conjecture. The runtime of MINLP solvers increases for more redundant ANN models and decreases for less redundant ANN models.
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Conjecture on unbounded root relaxation for RGUP KKT-based formulations
Let the RGUP constraints be the constraints presented in Appendix. Unbounded-relaxation conjecture. The result of Lemma holds for these RGUP constraints. The observed unbounded roo…
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Conjecture on unbounded root relaxation for EFL KKT-based formulations
Let the EFL constraints be the constraints stated in Appendix. Unbounded-relaxation conjecture. The result of Lemma holds for these EFL constraints. This would explain the unbounde…
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Transfer from full-information first-order to general binary oracles
Let denote the worst-case information complexity of a query strategy under the full-information first-order oracle based on a first-order chart…
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Exponential mixed-integer lower bound for general binary oracles
Let be the number of integer variables, let be the continuous dimension, and let , , , and be the problem parameters. A first-order chart…
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Constrained mixed-integer transfer conjecture
Let be a lower bound on the information complexity, with respect to a fixed oracle, for a family of continuous, constrained convex optimization instances. Mixed-integer tran…
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The sparsity conjecture for bound tightening in MILO formulations
The matrix is the quadratic coefficient matrix, and MILO denotes the mixed-integer linear optimization formulation obtained by reformulating the convex quadratic optimization p…
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Conjecture on outer approximations for conic quadratic formulations
Outer-approximation conjecture. The formulation might not be particularly challenging to solve via interior point methods, but it might be difficult to construct a good-quality out…
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Conjectured larger optimality gaps for big- formulations in sparse regression
Consider instances of best subset selection for which a mixed-integer optimization solver does not prove optimality within the allotted computation time, and compare their optimali…
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Projection conjecture for the mixed-integer multilinear formulation
Let be the mixed-integer multilinear feasible region considered in the formulation, and let be its extended formulation in the variables consisting of…
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Conjecture on the number of cuts required for adequate quadratic optimization relaxations
The experiments compare several formulations for quadratic optimization with indicator variables, including formulations with and without cuts, and consider instances whose size is…
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Strongest formulation conjecture for the refined unary floor-layout formulation
Let denote the floor-layout disjunction with lower bounds, and let be its eight-branch disjunction encoded by … Let denote the co…
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Equireplication conjecture for optimal two-block designs
Let be the number of treatments and the number of two-block observations. A design is equireplicate when the numbers of times each treatment is tested are as similar as pos…