Topic 3 Presentation of Educational Material

A correspondence is a rule that connects the elements of a set A (input set) with the elements of a set B (output set). A correspondence between the elements of the two sets A and B can be given in various ways, such as:

  1. With an arrow diagram. {e.x. FigA}
  2. By graph (set of ordered pairs) {e.x. FigB}
  3. Using type (if any) {e.x. y2 + 3x= -1}
  4. With a price table

  1. With verbal-descriptive wording or symbolically {e.x. a tree grows 20 cm every year, so the height of the tree is related to its age using the function h, h=age ⸱ 20 }
  • A function is the special case of a pairing from set A to set B, where each element of set A is paired with only one element of set B.
  • The set A is called the Definition Field
  • The set of elements of B that are paired with elements of A is called the price range of the function.

Fig1 (no function)

Fig 2 (function)