What does "greater than greater, less than smaller, in the middle" mean in mathematics?
It should be "less than the big one, greater than the small one, in the middle", which refers to the solution set formula of inequality group, meaning that X is greater than the small number and less than the big number, so the solution set of X is between these two numbers. For example, the solution set of x > 1x < 5x is between 1 and 5, and the solution set is 1 < x < 5.