**This Chapter “Relations and Functions” introduces the concepts covered in the chapter Relations and Functions
The combination of the register number of the student and his corresponding height is a relationship, which can be written as a set of ordered-pair numbers. Ordered-pair numbers are expressed as (x,y). The set of all elements of x is called the domain of the relation and the set of all elements of y is called the range of the relation.
Students also taught about the concepts of Cartesian product of sets, the number of elements in the Cartesian product of two finite sets, the definition of relation, pictorial diagrams, domain, co-domain and range of a relation. Along with the topic of relation, students get to learn about the topic of functions as well. Function as a special type of relation, pictorial representation of a function, domain, co-domain and range of a function, real-valued functions, domain and range of these functions, constant, identity, polynomial, rational, modulus, signum, exponential, logarithmic and greatest integer functions with their graphs are the few topics that come under the concept of Functions. Students will learn to link pairs of objects from two sets and then introduce relations between the two objects in the pair. And then, they will learn about special relations which will qualify to be functions
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