Zzz
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1 answers
20 votes
5k views
24 bookmarks
Proof that product topology of subspace is same as induced product topology
2 answers
7 votes
4k views
4 bookmarks
Continuity of cartesian product of functions between topological spaces
1 answers
5 votes
982 views
1 bookmarks
Product space that is compact, but isn't sequentially compact
3 answers
4 votes
215 views
Last digit of $1238237^{18238456}$
1 answers
2 votes
1k views
1 bookmarks
If $\gcd(a,b)=1$, then there exists integers $x$ and $y$ such that $xa + yb = 1$
1 answers
2 votes
57 views
Prove that norm $\| y \|=\sqrt{\int_{a}^{b}| y(x)|^2 dx}$ forms a linear space
0 answers
2 votes
116 views
1 bookmarks
Definition of extrema in calculus of variations
3 answers
2 votes
506 views
If $X$ is compact metric space, then $X$ is bounded
2 answers
1 votes
254 views
1 bookmarks
Continuous surjection from simple closed curve to unit circle
2 answers
1 votes
87 views
Formalize equivalence classes
0 answers
1 votes
65 views
2 bookmarks
Taylor's theorem for function F(x,y,z)
1 answers
1 votes
300 views
Definition of a neighborhood in normed linear space?
1 answers
1 votes
115 views
Euler-Lagrange example proof
1 answers
1 votes
387 views
3 bookmarks
Calculus of variations and Bernstein's theorem
2 answers
1 votes
121 views
Incomplete subspace of Banach space
1 answers
1 votes
108 views
Homeomorphism between $X/\tilde~$ and $Y/\tilde~'$
4 answers
1 votes
225 views
Every half-plane $H=\{(x,y)\in\mathbb{R}^{2}\mid ax+by+c\geq 0\}$ is connected
1 answers
1 votes
159 views
If $E\subseteq X$ is connected, $E\cap A\neq\emptyset$ and $E\cap(X\setminus A)\neq\emptyset$ then $E\cap\partial A\neq\emptyset$
1 answers
1 votes
108 views
1 bookmarks
Define product topology for subspace
1 answers
0 votes
394 views
1 bookmarks
Calculus of variations and Euler's equation
1 answers
0 votes
319 views
2 bookmarks
Increment of a functional and Taylor's theorem
3 answers
0 votes
277 views
$(\omega +3)\cdot\omega=\omega\cdot\omega$
1 answers
0 votes
219 views
Generated subframe of a frame
1 answers
0 votes
125 views
Find an equivalent standard translation for FO formula
1 answers
0 votes
244 views
1 bookmarks
Proof that standard translation of modal formula is equivalent to the FO formula
2 answers
0 votes
439 views
Quotient topology $\mathbb{R}/\sim $ where $x\sim y$ iff $x-y\in\mathbb{Z}$
1 answers
0 votes
43 views
$G=U\cap F$, where $U\subseteq X$ is closed, iff $G\subseteq F$ closed in $X$
1 answers
0 votes
70 views
Proof that $\{\,\left]a,\infty\right [\mid a\in\mathbb{R}\,\}\cup\{\mathbb{R} \}\cup\{\emptyset \}$ is topology of $\mathbb{R}$
1 answers
0 votes
52 views
1 bookmarks
How to define that in which hierarchy certain language belongs?
1 answers
0 votes
3k views
Is epsilon a useless symbol and when epsilon does belong into CFL?