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Feb
1
comment Question about Boolean algebra and ultrafilters
Thank you. "Filter base" was not mentioned in the lecture.
Feb
1
accepted Question about Boolean algebra and ultrafilters
Jan
31
comment subsets of $\ell_{n}^{p}(\mathbb{R})$ and $\ell_{n}^{p}(\mathbb{C})$
What's $l^p_n$?
Jan
31
comment Question about Boolean algebra and ultrafilters
@AndréNicolas Thanks! Then you're saying my proof is right? This would answer my question. You don't have to type up a full answer.
Jan
31
asked Question about Boolean algebra and ultrafilters
Jan
31
comment $\mathbb{Q}$ in metric space $(\mathbb{R},d)$ neither open nor closed
@BenjaminLim I'm sorry for adding to the confusion!
Jan
31
comment $\mathbb{Q}$ in metric space $(\mathbb{R},d)$ neither open nor closed
@BenjaminLim Ignore my comment.
Jan
31
comment $\mathbb{Q}$ in metric space $(\mathbb{R},d)$ neither open nor closed
@BrianM.Scott I meant to write complete there. : S Not compact.
Jan
31
comment $\mathbb{Q}$ in metric space $(\mathbb{R},d)$ neither open nor closed
@BenjaminLim But a set in which every Cauchy sequence has a limit in it is called compact. If you take $(0,1)$ as the whole space then this set will have Cauchy sequences (with respect to the standard metric) that converge to $0$ or $1$ and yet this set is closed.
Jan
30
comment Proof of two facts on the von Neumann hierarchy by transfinite induction
There was already a good answer but I thought I'd add an answer to the second part, just for completion.
Jan
30
answered Proof of two facts on the von Neumann hierarchy by transfinite induction
Jan
25
revised Proof of two facts on the von Neumann hierarchy by transfinite induction
edited tags
Jan
24
comment a question on transfinite recursion on $\mathbf{ON}$
@MartinSleziak Nice, thank you!
Jan
24
accepted Limit involving floor function
Jan
24
asked Limit involving floor function
Jan
23
revised Closure of $A \subset \mathbb{R}$
Added the other direction of the proof.
Jan
23
revised What would you call Apollonian circles that are located within polygon
edited title
Jan
23
revised Closure of $A \subset \mathbb{R}$
added 15 characters in body
Jan
23
comment Closure of $A \subset \mathbb{R}$
@BrianM.Scott Thanks Brian, I had not thought it through enough. I changed the definition of limit point.
Jan
23
revised Closure of $A \subset \mathbb{R}$
Definition of limit point changed.