11. The consultants used open educational resources ( OER ) * to prepare the problems and solutions sets . 12. Thus the solution set may be a plane, a line, a single point, or the empty set. 13. Then you would just have to search among the ( countable ) solution set for perfect squares. 14. If all eigenvalues of A are non-zero, then the solution set is an ellipsoid or a hyperboloid. 15. Analytically, such a convex polyhedron is expressed as the solution set for a system of linear inequalities. 16. This is true for all values of " x ", so the solution set is all real numbers. 17. In the example above, the solution is also a parametrization of the solution set with the parameter being. 18. When solving sums which have a limited number of solution sets then that can lead to useful clues. 19. In broad terms, a constructible set is the solution set of a system of polynomial equations and inequations. 20. An "'acnode "'is an isolated point in the solution set of a polynomial equation in two real variables.