A binary relation from A to B is a subset of a Cartesian product A x B. Drawing a straight line passing through these points will represent the function in a graphical way. It is the study of mathematical structures that are fundamentally discrete in nature and it does not require the notion of continuity. Function: type of functions, growth of function. Here, we will draw a graph showing the connection between the two elements of two sets say x and y such that x â X and y â Y. Plotting the satisfying points of x and y in the respective axes. . ematician Georg Cantor. Discrete Mathematics Online Lecture Notes via Web. Discrete Mathematics Online Lecture Notes via Web. . R is transitive x R y and y R z implies x R z, for all x,y,zâA Example: i<7 and 7