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9:00 AM
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Q: Is the set $ D $ open?

hnuyqOn the set of all real numbers with usual topology, let $ D = \bigcap_{n=1}^{\infty} \left(0, 5 + \frac{1}{n} \right)$ Is the set $D $ open? Find $\text{int}(D)$ and $\overline{D}$.

 
 
3 hours later…
11:53 AM
@Peter Is it really necessary to so rudely express your displeasure at the reopening to the person who posted the question, and is asking for help?
2
If you have nothing positive to add, is it necessary to break your silence?
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8 hours later…
7:31 PM
0
Q: Does this Collatz conjecture proof contain an error?

Anargyros LaskaridisSo, i thought of the following regarding the Collatz conjecture: Every number generated by the Collatz conjecture is an integer. If the n is a odd number then immediatelly after the first iteration we will have an even number after that so we can immediatelly skip an iteration and define the sec...

 

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