Question #282264

 Find the limit points of {1nnN} in R\text { Find the limit points of }\left\{\frac{1}{n} \mid n \in \mathbb{N}\right\} \text { in } \mathbb{R} \text {. } (DG)


1
Expert's answer
2021-12-27T18:32:37-0500

A limit point of a set AA in a topological space XX is a point xx that can be "approximated" by points of AA in the sense that every neighbourhood of xx with respect to the topology on XX also contains a point of AA other than xx itself.

In our case, for the set A={1nnN}A=\{\frac{1}n∣n∈\N\} in R\R with standard topoogy the limit point is x=0.x=0. Indeed, any basic open neighbourhood (ε,ε)(-\varepsilon,\varepsilon) of x=0x=0 contains all elements xn=1nx_n=\frac{1}n for natural numbers n>1ε.n>\frac{1}{\varepsilon}.


Need a fast expert's response?

Submit order

and get a quick answer at the best price

for any assignment or question with DETAILED EXPLANATIONS!

Comments

No comments. Be the first!
LATEST TUTORIALS
APPROVED BY CLIENTS