Function - BZU PAGES: Find Presentations, Reports, Student's Assignments and Daily Discussion; Bahauddin Zakariya University Multan

**BSIT07-01** · #1 27-09-2007, 06:11 PM

Math for IT

Function:
It is a relationship between two sets, one is called Independent While other is called Dependent set.
?: A?B
e.g.:
y = ? (x) = x2
If we put the Value of x then
When x = 1
y = ? (1) = 12 = 1
When x = 2
y = ? (2) = 22 = 4
When x = 3
y = ? (3) = 32 = 9
When x = 4
y = ? (4) = 42 = 16
When x = a
y = ? (a) = a2
f : X → Y
X = {1, 2, 3, 4, a}
Y = {1, 4, 9, 16, a2}
Domain:
The independent set of function is called Domain
X is the Domain of f because x is independent
Range:
The dependent set of function is called Range
Y is the Range of f because y is dependent

Some Points to Remember:

One Element of Domain should not have Two Images
Every element of Domain should have an Image
Two elements may have a Single Image.

Difference Between Range & Co domain: