REA book review question
Posted: Thu Oct 04, 2012 11:07 pm
on Page 90, sample test 2, problem 62:
Let R be a ring and let x<>0 be a fixed element in R. Which of the followin is a subring of R?
In the choices, there is one {nx|n is an integer}.
I think this is a subring, since rings do not have to be closed under multiplication. However, the answer gives no.
Any idea?
Let R be a ring and let x<>0 be a fixed element in R. Which of the followin is a subring of R?
In the choices, there is one {nx|n is an integer}.
I think this is a subring, since rings do not have to be closed under multiplication. However, the answer gives no.
Any idea?