Do you know the definitions of "accumulation point" and "isolated point"?
Have you drawn a picture of these sets?
If you know the basic definitions (1) and (2), at least, should be easy.
1)
X={(2a,2b) | a,b integers}
2)
Y={(p,q) | p,q rational}
3)
Z={(1/n,m/n) | m,n integers, n not equal 0}
4)
W={(1/n+1/m,1) | m,n integers, m and n not equal 0}
Hope someone can help... very confused and struggling
Do you know the definitions of "accumulation point" and "isolated point"?
Have you drawn a picture of these sets?
If you know the basic definitions (1) and (2), at least, should be easy.
Hi HallsofIvy,
Thank you for your reply. I read alot of the definitions in text and online and I'm not too sure if I have understood correctly. So for the 1st question. The set X is a set of even numbers right? So is acc(X) a set of even numbers?