Thu April 21, 2011 By: Rohan Mehra

Let R be a relation from N-N.Is it necessary that that all the elements of the domain should have an image?

Expert Reply
Fri April 22, 2011

Yes, it is necesary that all elements of domain have a image.

 For eg. if you define a relationship in a roster form and in a circumstance if there is no image for a particular domain the value will be null which is not possible.
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