Infinitesmal

general recent conversations

$Mathematics$ Set theory

Anything related to set theory. For instructions how to render...

Infinitesmal

Oct 26, 2021 09:56

Or am I mistaken

Infinitesmal

Oct 26, 2021 09:15

@MartinSleziak what do you mean you answered me no?

Infinitesmal

Oct 26, 2021 09:09

@MartinSleziak I am sorry for wasting your time thanks for your help very much.

Infinitesmal

Oct 26, 2021 08:37

A limit point of X is a point such that for every neighbourhood of the point there is a point of X in the neighbourhood

Infinitesmal

Oct 26, 2021 08:36

countable sets generally avoid choice

Infinitesmal

Oct 26, 2021 08:34

I think choice an be avoided for countable sets but not sure how

Infinitesmal

Oct 26, 2021 08:33

But what about for countable sets

Infinitesmal

Oct 26, 2021 08:33

I know for general sets that countable choice is needed

Infinitesmal

Oct 26, 2021 08:33

@MartinSleziak Yes of course but I don't want to use axiom of choice

Infinitesmal

Oct 26, 2021 08:28

@MartinSleziak

Infinitesmal

Oct 26, 2021 08:28

By limit point I mean the def given in rudin

Infinitesmal

Oct 26, 2021 08:27

But that needs the axiom of choice

Infinitesmal

Oct 26, 2021 08:21

Thanks for your previous ans btw

Infinitesmal

Oct 26, 2021 08:21

@MartinSleziak

Infinitesmal

Oct 26, 2021 08:21

Without axiom of countable choice

Infinitesmal

Oct 26, 2021 08:20

Is it possible to prove that if $X$(in some metric space) is a countable set and $w$ is a limit point of it then there is a sequence consisting of elements in $X$ which coverges to it ?

Infinitesmal

Oct 18, 2021 05:22

@MartinSleziak Why can we use set theory in first order logic if first order logic is the foundation of math

Infinitesmal

Oct 15, 2021 13:50

Just posting here to draw attention of experts

Infinitesmal

Oct 15, 2021 13:50

@MartinSleziak

Infinitesmal

Oct 15, 2021 13:49

Q: What is the intuition for why all of math can be developed using set theory?

I learnt that formal language of pure set theory allows one to formalize all mathematical notions and arguments. The language just has one non logical symbol(!) "the belongs to relation" this is surprising to me is there an intuition for why this is true? I mean its surprising that math has such ...

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Infinitesmal

Oct 16, 2021 14:31

@user21820 I am willling to even delete my accounts and loose all my hard earned reputation as a punishment

Infinitesmal

Oct 16, 2021 14:30

@user21820 please give me a last chance I promise I won't disappoint , I did not think of the consequences of my actions and now realise the grave mistake I made. I am grateful to you for willing to forgive me after seven months but that's just too much time ,I really need some help. I promise I won't repeat my mistakes.

Infinitesmal

Oct 15, 2021 17:15

I have no other teacher and am just in grade 9@user21820 I try my best but made a grave mistake. I am really begging you .

Infinitesmal

Oct 15, 2021 17:10

no one else can teach m

Infinitesmal

Oct 15, 2021 17:09

I promise to listen to you

Infinitesmal

Oct 15, 2021 17:09

@user21820 7 months is too much I have many questions every day please consider helping me one last time. I can't learn in any other way. I really regret my past mistakes

Infinitesmal

Oct 15, 2021 16:54

@user21820 please forgive me I beg you.

Infinitesmal

Oct 15, 2021 16:39

Q: What is the intuition for why all of math can be developed using set theory?

soft-question set-theory

Infinitesmal

Oct 15, 2021 12:34

@user21820 please tell me prove that as well please give the links

Infinitesmal

Oct 15, 2021 12:31

so that I can prove that as well

Infinitesmal

Oct 15, 2021 12:30

I guess you think I am Vivaan Daga or Pax Daga because I proved I am not math can you give a link to their accounts please

Infinitesmal

Oct 15, 2021 12:28

but I need help in set theory I would not have extended the discussion after you were so mean to me if I did nt believe you can help me

Infinitesmal

Oct 15, 2021 12:26

how? please this is unfair

Infinitesmal

Oct 15, 2021 12:26

can you give me a way to prove that I'm not one of the users ?

Infinitesmal

Oct 15, 2021 12:25

I am not the same person there is no way I can prove it to you but you can check my details

Infinitesmal

Oct 15, 2021 12:23

now I am a fresh user as I quit SO

Infinitesmal

Oct 15, 2021 12:23

Well tell me how a user from the same IP can make two accounts? I have been on SO before and they said that its not possible

Infinitesmal

Oct 15, 2021 12:22

there is nothing I can do know this is wrong I am not the user.

Infinitesmal

Oct 15, 2021 12:19

@user21820 I am not that user I am just a poor user asking for help, I do not feel nice for not getting help when I'm not the user.

Infinitesmal

Oct 15, 2021 11:44

@user21820 can you tell me why you think I'm either of them?

Infinitesmal

Oct 15, 2021 11:42

I really need some in help in set theory, I can ask on "questions" but I need an experts help in making things precise , if you want I will prove to you that I am not either of these users you only linked to user "math" profile but I can't be that user because that user has so many answers while I only have one Q.

Infinitesmal

Oct 15, 2021 11:32

@user21820 Let me tell you to not throw wild accusations maybe these 3 users have. wronged you but I don't know why you think I'm one of them

Infinitesmal

Oct 15, 2021 11:12

@user21820 i am a new user I am neither of these three.I can't understand

Infinitesmal

Oct 15, 2021 11:07

Are you saying that because you think I was the dwonvoter on your post I don't even have the "rep" to downvote

Infinitesmal

Oct 15, 2021 11:05

@user21820 I have not fooled anyone

Infinitesmal

Oct 15, 2021 11:04

@user21820 I have absolutely no idea what your talking about

Infinitesmal

Oct 15, 2021 10:59

@user21820 who am I ? you're mistaking me for someone else.

Infinitesmal

Oct 15, 2021 10:53

@user21820 I don't understand what your saying. I don't know why you are behaving so meanly with me I just wanted to ask a question

Infinitesmal

Oct 15, 2021 10:45

@user21820 what did I do wrong I am new to this site

Infinitesmal

Oct 15, 2021 10:42

@user21820 can you tell me what q's are permitted

Infinitesmal

Set theory

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$Mathematics$ Set theory

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