Answer:
he domain or set of departure of a function is the set into which all of the input of the function is constrained to fall.[1] It is the set X in the notation f: X → Y, and is alternatively denoted as {\displaystyle \operatorname {dom} (f)}{\displaystyle \operatorname {dom} (f)}.[2] Since a function is defined on its entire domain, its domain coincides with its domain of definition.[3] However, this coincidence is no longer true for a partial function, since the domain of definition of a partial function can be a proper subset of the domain
