- #1
SYoungblood
- 64
- 1
Homework Statement
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Is {n} an open set?
Homework Equations
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To use an example, for any n that is an integer, is {10} an open set, closet set, or neither?
The Attempt at a Solution
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I say {10} is a closed set, because it has upper and lower bounds right at 10; in other words, it is both open and closed on the number line right at 10.
However, I believe the compliment of {10}, (-inf, 10) u (10, inf) is an open set.
I'm just starting to learn basic topology, thank you for any help that you can offer.
SY