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10h
revised Familiar spaces in which every one point set is $G_\delta$ but space is not first countable
Corrected $G-\delta$ to $G_\delta$.
Feb
4
revised Ultrafilter and upper natural densities
Changed ... to \ldots.
Feb
3
revised Many point compactification
deleted 2 characters in body
Feb
2
revised Take away games
added 176 characters in body
Feb
2
revised Prove that the intersection of all the sets is nonempty.
Added the aside.
Feb
1
revised open equivalence relation and closed graph of it
added 1258 characters in body
Jan
30
revised Consider the given regular grammar what are the Myhill-Nerode equivalence classes for the language generated by the grammar?
added 2 characters in body
Jan
30
revised Are the following families of sets closed under intersection?
edited tags
Jan
28
revised $F_\sigma$-subsets in a normal space can be separated
Fixed bad typo in (1) and (2).
Jan
28
revised How can I change the bounderies of the following sum
added 684 characters in body
Jan
28
revised Find such collection of functions whose countable supremum is again that type of function but arbitrary supremum is not?
MathJax, formatting.
Jan
26
revised No subsequence converges when sequence has limit point in topological space
added 505 characters in body
Jan
26
revised No subsequence converges when sequence has limit point in topological space
added 867 characters in body
Jan
26
revised Does a finite first-order theory which has a model always have a finite model?
Removed superfluous condition.
Jan
24
revised How many distinct, non-negative integer solutions are there for $2x_0+\sum_{i=1}^{m}{x_i}=n$?
Corrected wording in light of comments.
Jan
24
revised Prove that $\binom{n}{0}\cdot \binom{2n}{n}-\binom{n}{1}\cdot \binom{2n-2}{n}+\binom{n}{2}\cdot \binom{2n-4}{n}+… = 2^n$
Fixed typo.
Jan
24
revised Prove that $\binom{n}{0}\cdot \binom{2n}{n}-\binom{n}{1}\cdot \binom{2n-2}{n}+\binom{n}{2}\cdot \binom{2n-4}{n}+… = 2^n$
added 106 characters in body
Jan
24
revised How many binary strings of length $n$ with no two adjacent 1's and four more 0's than 1's?
Improved hint.
Jan
23
revised Find a (simple?) counterexample to this statement about topological manifolds.
Restored example and expanded explanation.
Jan
23
revised Find a (simple?) counterexample to this statement about topological manifolds.
Corrected final sentence and removed questionable example.