Question: An author may have written nothing An author can write a book or contribute an article, but not both Every book has up to one
An author may have written nothing
An author can write a book or contribute an article, but not both
Every book has up to one author
An author who has written a book has also contributed to an article
Step by Step Solution
There are 3 Steps involved in it
1 Expert Approved Answer
Step: 1 Unlock
Question Has Been Solved by an Expert!
Get step-by-step solutions from verified subject matter experts
Step: 2 Unlock
Step: 3 Unlock
