It could be a ruler. Just a number line.
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i think its a line graph
Is that the 'scale'?
an ellipse.
The derived set of a set of rational numbers is the set of all limit points of the original set. In other words, it includes all real numbers that can be approached arbitrarily closely by elements of the set. Since the rational numbers are dense in the real numbers, the derived set of a set of rational numbers is the set of all real numbers.
The set of numbers which 3 does not belong is the set of even numbers.