On 4-critical planar graphs with high edge density
Discrete Mathematics
Proceedings of the first Malta conference on Graphs and combinatorics
Lower bounds for the polynomial calculus and the Gröbner basis algorithm
Computational Complexity
Good Degree Lower Bounds on Nullstellensatz Refutations of the Induction Principle
CCC '96 Proceedings of the 11th Annual IEEE Conference on Computational Complexity
The division algorithm and the hilbert scheme
The division algorithm and the hilbert scheme
Combinatorics, Probability and Computing
A branch-and-cut algorithm for graph coloring
Discrete Applied Mathematics - Special issue: IV ALIO/EURO workshop on applied combinatorial optimization
Semidefinite representations for finite varieties
Mathematical Programming: Series A and B
Ideals, Varieties, and Algorithms: An Introduction to Computational Algebraic Geometry and Commutative Algebra, 3/e (Undergraduate Texts in Mathematics)
Algebraic characterization of uniquely vertex colorable graphs
Journal of Combinatorial Theory Series B
Computer algebra, combinatorics, and complexity: hilbert's nullstellensatz and np-complete problems
Computer algebra, combinatorics, and complexity: hilbert's nullstellensatz and np-complete problems
Computing infeasibility certificates for combinatorial problems through Hilbert's Nullstellensatz
Journal of Symbolic Computation
An algebraic characterization of rainbow connectivity
CASC'12 Proceedings of the 14th international conference on Computer Algebra in Scientific Computing
Most Tensor Problems Are NP-Hard
Journal of the ACM (JACM)
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Systems of polynomial equations over an algebraically-closed field K can be used to concisely model many combinatorial problems. In this way, a combinatorial problem is feasible (e.g., a graph is 3-colorable, hamiltonian, etc.) if and only if a related system of polynomial equations has a solution over K. In this paper, we investigate an algorithm aimed at proving combinatorial infeasibility based on the observed low degree of Hilbert's Nullstellensatz certificates for polynomial systems arising in combinatorics and on large-scale linear-algebra computations over K. We report on experiments based on the problem of proving the non-3-colorability of graphs. We successfully solved graph problem instances having thousands of nodes and tens of thousands of edges.