
Many  One Function: If the function f: A>B is such that 2 or more elements a_{1}, a_{2}.... of A have the same fimage in B, then the mapping is called manyone mapping or manyone function. Note that f:A>B is not oneone then it is manyone. One  One Onto Function If the function f is both oneone and onto then f is called oneone onto function. It is also called a bijection or a bijective function. In other words, a function f: A >B is bijective if
Example: If R>R be a function defined by f(x) = 5x^{3}8, show that the function is a bijective function. Directions: Answer the following. 