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15
Math.TechQA.Club
2026-03-25 18:47:37
2.6k
Views
Proving that the set of continuous nowhere differentiable functions is dense using Baire's Category Theorem
Published on
25 Mar 2026 - 18:47
#real-analysis
#metric-spaces
#baire-category
76
Views
Show that if x and y are of same length, there must exist an isometry with f(x) = y
Published on
25 Mar 2026 - 9:29
#linear-algebra
#metric-spaces
#isometry
124
Views
$A$ has empty interior iff $A^c$ is dense in M.
Published on
11 Nov 2018 - 6:25
#proof-verification
#metric-spaces
459
Views
Proving a metric space - $(\mathbb R^n, d_\infty)$
Published on
11 Nov 2018 - 7:32
#metric-spaces
442
Views
Metric Space - A point outside unit ball in $l^1(\mathbb R^2)$ and inside unit ball in $l^\infty (\mathbb R^2)$.
Published on
29 Mar 2026 - 5:12
#metric-spaces
#normed-spaces
#lp-spaces
38
Views
metric spaces: clarification on Open and Closed sets.
Published on
11 Nov 2018 - 15:03
#general-topology
#metric-spaces
176
Views
Homeomorphism preserves category
Published on
11 Nov 2018 - 16:12
#real-analysis
#general-topology
#metric-spaces
34
Views
Proving if $f_n(a)\to f(a)$ then $f(a)=a$ in $C_{[0,1]}$
Published on
11 Nov 2018 - 18:26
#general-topology
#proof-verification
#metric-spaces
#proof-writing
281
Views
Show that support function of any set in $\mathbb{R}^n$ is lower semi-continuous function.
Published on
23 Feb 2026 - 6:28
#functional-analysis
#functions
#convergence-divergence
#metric-spaces
#semicontinuous-functions
1.3k
Views
Continuous function $f:X\to X$ such that $d(f(x), f(y)) < d(x, y)$ whenever $x\neq y$, has a fixed point in complete metric space.
Published on
25 Mar 2026 - 10:25
#metric-spaces
#complete-spaces
#fixed-points
110
Views
Show that $\overline{E_{1}\cup E_{2}}=\overline{E_1}\cup\overline{E_{2}}$.
Published on
12 Nov 2018 - 4:50
#real-analysis
#analysis
#proof-verification
#metric-spaces
808
Views
Are second-countable metric spaces $\sigma$-compact?
Published on
12 Nov 2018 - 10:56
#general-topology
#metric-spaces
43
Views
Does ordered set hold between two different metrics
Published on
12 Nov 2018 - 18:26
#metric-spaces
110
Views
Extension of a non-negative and symmetric real valued function to a pseudometric
Published on
12 Nov 2018 - 21:48
#metric-spaces
586
Views
Proving $A\iff(B\implies C)$ (in Rudin 4.2 definition of a limit of a function)
Published on
03 Apr 2026 - 4:53
#metric-spaces
#proof-explanation
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