Recently I saw some inaccurate statements about a question on topology, so I have written this short paper in order to clarify those wrong statements!

- Michele_Laino

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- katieb

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- Michele_Laino

##### 1 Attachment

- anonymous

good job :)

- anonymous

Do you mind if I save this on my computer?

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## More answers

- Michele_Laino

thanks! :) @heretohelpalways

- Michele_Laino

yes sure! :) @SpooderWoman

- anonymous

Thanks

- imqwerty

Nice work @Michele_Laino

- Michele_Laino

here is my reference:
\[\Large \begin{gathered}
{\text{John M}}{\text{. Lee}} \hfill \\
{\text{Introduction to Topological Manifolds}} \hfill \\
{\text{Springer }}\left( {{\text{first edition}},2000} \right) \hfill \\
\end{gathered} \]

- Michele_Laino

thanks! :) @imqwerty

- anonymous

hi @Michele_Laino you made a wonderful prove there but i fink it is better to forgive and forget. you a making a big issue out of this and you make me feel i caused every thing

- Michele_Laino

dear @GIL.ojei as I said you yesterday, you don't have to feel yourself the cause of everything

- amistre64

topology is not an area i am familiar with, but i did just peruse the other posting :) it was enlightening regardless of who was doling out inaccuracies.

- Michele_Laino

thanks! for your appreciation @amistre64 :)

- anonymous

@GIL.ojei It could have been anybody :) I think @Michele_Laino did a great job; she probably took time out of her schedule to write this paper. I think it is awesome.

- anonymous

correction the "it" in my last reply was supposed to be "the paper"

- Michele_Laino

thanks again! @heretohelpalways

- Astrophysics

I do not know topology very well, or any for that matter haha, but I totally agree with amistrte, thanks @Michele_Laino :-)

- Michele_Laino

thanks! @Astrophysics :)

- anonymous

lol, it's like you read my posts and then butchered them in an attempt to cloak your incorrect answers. it's okay to be wrong sometimes, you know

- anonymous

there is nothing in this post aside from an unrelated, unnecessary, and pointless proof that singletons are closed in a Hausdorff space that I did not explicitly state in my posts in the original thread. once again, it was made explicitly clear that the definition of an open ball centered at \(p\) in a metric space \((X,d)\) is for \(r>0\), and so the question was nonsense to start with. furthermore, generalizing it to \(r=0\) in the immediately obvious way does not yield a singleton set but instead an empty set, and this amounts to the fact that \(d\ge0\implies d\not<0\), so no points could satisfy the open-ball membership condition \(d(p,x)< 0\) over \(x\in X\)

- anonymous

and perhaps the most depressing part of this entire charade is that you're still stating things that are false despite the best efforts of others to help show you the logical error you're making. consider in your paper extending the definition of an open ball in the obvious way by allowing \(r\ge0\) with the same definition, $$B_r(p)=\{x\in X:d(p,x)

- anonymous

also, can you give any logical reason to bring Kant into this other than as an attempt to brag about your high school philosophy credentials? you're not even thinking of the same idea of extension, really; Kant is referring to extension as in the property of having extent, not the notion of extension as generalization

- Michele_Laino

From the last reply to my post, I see that other details are needed:
saying that an open ball can have radius r=0, is how to make an illogical statement, since, as I wrote before, an open ball with radius r=0 doesn't exist, at least in my books, maybe that into your textbooks an openball with radius r=0 does exist, I don't know.
I never said that 0<0, I always said, and I say it here again, that the claim that an open ball can have radius r=0, is simply an absurd statement without any logical foundation, so why to attempt to solve a question which has not solution?
Again, someone want to accuse me of bragging myself, of course that is false, here is why:
mathematics is the natural subject of application of the Kantian metaphysics, infact all mathematics is built using synthetic judgements a priori. In that sense a generalization is an enlargement of the logical validity of a judgement, at the opposite end, saying that the definition of an openball can be made also with r=0, means that I'm doing an enlargement of an empiricism, and, as Kant has said, an enlargement of the empiricism can not never become a synthetic judgement a priori.
As I can see, the Kantian thought has not been well understood!
Furthermore, I have not attended a high school, since I have attended a vocational school, in other words, I learned the kantian philosophy at university.
Finally, another note for my very arrogant interlocutor:
my exposition, is not a charade, it is a collection of some proofs which your friend requested from me (please read the replies inside the previous post).
Again I see that your arrogance and rudeness are higher than your knowledge.

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