A familiar example is the concept of the graph of a function.
The graph of a function on real numbers is identical to the graphic representation of the function.
The graph of a function is contained in a cartesian product of sets.
It's just a graph of a function which happens to be a straight line.
It does this by representing the relation as the graph of a function.
However, it is possible to represent part of the circle as the graph of a function of one variable.
Some natural geometric shapes, such as circles, cannot be drawn as the graph of a function.
It represents the idea that the graph of a continuous function on a closed interval can be drawn without lifting your pencil from the paper.
Integration is a mathematical operation that corresponds to the informal idea of finding the area under the graph of a function.
The graph of a differentiable function must have a non-vertical tangent line at each point in its domain.