| From there analogy was understood as identity of relation between any two ordered pairs, whether of mathematical nature or not. |
| In addition to his work on geometry, Bolyai developed a rigorous geometric concept of complex numbers as ordered pairs of real numbers. |
| Mathematical concepts that are taught include how to plot data points from a table, how to label ordered pairs, and how to name coordinates on a grid. |
| In 1814 Argand had represented the complex numbers as points on the plane, that is as ordered pairs of real numbers. |
| Finally, Edges are ordered pairs of Nodes. |
| Relation, in logic, a set of ordered pairs, triples, quadruples, and so on. |
