関連ワード:  what is slack in linear programming    what is surplus in linear programming    what is slack variable in linear programming    what is slack and surplus in linear programming    what is surplus variable in linear programming    what is slack and surplus variable in linear programming    what is slack variable used for in linear programming    what is the role of slack variables in linear programming    what is slack in the context of constraints in linear programming    what is the purpose of a slack variable in a linear programming problem