Register to reply 
Subring math helpby 1800bigk
Tags: subring 
Share this thread: 
#1
Nov1205, 09:20 AM

P: 42

Let S = {RZ}, the set of all reals that are not integers. Is S a subring of R? I think not because 1/2 is in S but 1/21/2=0 so S is not closed under subtraction so is not a subring.
is that right? 


#2
Nov1205, 11:43 AM

Sci Advisor
HW Helper
P: 9,495

what do you think? and why do you think it? if i say you are wrong, would you believe me? why or why not?



#3
Nov1205, 12:11 PM

P: 42

i think im right, im asking because some of the kids in my class said zero is not an integer and they said i should of picked two distinct elements to show its not closed but i said it didnt matter.



#4
Nov1205, 01:06 PM

Sci Advisor
HW Helper
P: 2,586

Subring math help
In which class are you learning about rings where the students don't believe that 0 is an integer and believe that you have to pick two distinct elements to show it's not closed?



Register to reply 
Related Discussions  
Identity in a subring  Calculus & Beyond Homework  2  
A subring in the same domain?  Calculus & Beyond Homework  5  
Which is a subring?  Linear & Abstract Algebra  4 