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Maksim
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57 Answers

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8
An alternative proof of an application of Hahn-Banach
Mar 11 '19 at 11:24
8
Why does $\int_a^b f(x)h'(x) \, \mathrm{d}x=0$ imply that $f$ is constant?
Feb 15 '19 at 19:10
4
$c_0(N)$ is not dense in $c(N)$ for any norm.
Mar 9 '19 at 16:37
3
How to show that $\sum_{i=1}^\infty\frac{1}{i\cdot2^i}=\ln2$?
Feb 10 '19 at 16:35
3
Prove $ \sup\limits_{t \in A} |x(t) - y(t)|$ defines a metric for the space of bounded functions.
Feb 9 '19 at 23:00
3
Show that $f_n \rightarrow 0$ in $C([0, 1], \mathbb{R})$
Dec 7 '18 at 1:23
2
Relation between the norms
Sep 4 '20 at 14:18
2
Norm of particular continuous linear operator
Apr 1 '19 at 15:48
2
Uniform convergence on closure of a set
Mar 19 '19 at 18:43
2
Proving an inequality without an integral: $\frac {1}{x+1}\leq \ln (1+x)- \ln (x) \leq \frac {1}{x}$
Mar 13 '19 at 22:45
2
$ \mu(|f|\geq \alpha) = \frac{1}{\alpha} ||f||_1$
Feb 14 '19 at 15:33
2
Find all values $k$ such that the set $S = \{x^3+x+1, x^3−x^2+1, x^3+k x^2+k x\}$ is linearly independent in $P$
Feb 8 '19 at 17:08
2
Riemann/Lebesgue integrability of a function
Jan 25 '19 at 7:42
2
Is $i: (C^1, ||·||_{W^{1,2}}) → (C^0, ||·||_∞)$ a linear, continuous, compact map?
Jan 21 '19 at 16:39
1
Can a polynomial function limited by x axis values be convex?
Dec 12 '20 at 13:28
1
a relationship between local compactness and closure
Apr 6 '19 at 15:18
1
Example of a function f and a set E with the following: f is uniformly continuous on E, but f doesn't attain either a max or a min on E.
Mar 28 '19 at 20:47
1
sum of convex cone with apex at 0 and its closure
Mar 28 '19 at 18:18
1
Doubt about a lemma in Hoffman and Kunze's *Linear Algebra* section 6.2
Mar 27 '19 at 22:45
1
Existence of the inscribed hypersphere of a simplex
Mar 21 '19 at 18:33
1
Is the dimension of a binary linear code the number of codewords it contains?
Mar 14 '19 at 13:19
1
Finite series sum I cannot figure out
Mar 11 '19 at 0:23
1
Internal differentiation
Feb 14 '19 at 21:57
1
Rudin functional analysis, theorem 3.23. Use of separation property.
Feb 14 '19 at 14:23
1
Rudin functional analysis, theorem 3.23. Finite intersection property
Feb 13 '19 at 14:35
1
Uniform continuity with respect to one variable?
Feb 11 '19 at 16:26
1
Is there any way to use matrix decomposition for finding $A^n$?
Feb 10 '19 at 1:30
1
Let $u'(t)=Au^2-Bu$. Find conditions on A, B to guarantee global solution.
Feb 9 '19 at 16:39
1
An inequality involving two probability densities
Feb 9 '19 at 12:24
1
Assume $\sum a_k$ is a series of positive terms that converges. Prove that $\sum \frac1{a_k}$ is divergent
Feb 8 '19 at 18:28
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