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15
Math.TechQA.Club
2019-09-16 02:20:02
54
Views
Integrable on subintervals but not integrable on the whole interval
Published on
16 Sep 2019 - 2:20
#real-analysis
#examples-counterexamples
342
Views
Counterexample to $\mathcal{H} = M \oplus M^{\perp}$ where $M$ not closed, $\mathcal{H}$ Hilbert
Published on
27 Mar 2026 - 21:20
#functional-analysis
#hilbert-spaces
#examples-counterexamples
#orthogonality
137
Views
An example of a Lebesgue measurable set which is not a Borel set and why?
Published on
25 Mar 2026 - 20:13
#real-analysis
#measure-theory
#examples-counterexamples
#cantor-set
#borel-sets
41
Views
Question about Module "localization"
Published on
27 Mar 2026 - 12:34
#abstract-algebra
#commutative-algebra
#modules
#examples-counterexamples
#localization
180
Views
Example of "almost" ring with non-abelian additive group
Published on
17 Sep 2019 - 23:08
#abstract-algebra
#ring-theory
#examples-counterexamples
344
Views
Direct construction of the real numbers using only the integers (c.f. Eudoxus reals)
Published on
29 Mar 2026 - 22:40
#real-analysis
#group-theory
#examples-counterexamples
#real-numbers
#binary
121
Views
About the equation $\mathbb{P}(A\cap B | C\cap D) =\mathbb{P}(A|C)\mathbb{P}(B|D) $
Published on
19 Sep 2019 - 15:44
#probability
#examples-counterexamples
#conditional-probability
41
Views
Size of infinite sets equality #$A$=#($A\cup B$) and counterexample for $A\cap B\ne\emptyset$
Published on
20 Sep 2019 - 17:35
#elementary-set-theory
#proof-explanation
#examples-counterexamples
41
Views
Does there exist two h-equal but not h-equivalent topological spaces?
Published on
23 Feb 2026 - 4:45
#algebraic-topology
#examples-counterexamples
#homotopy-theory
#retraction
69
Views
understanding the definition of Cantor-Lebesgue function $\emptyset$ on the cantor set in Royden.
Published on
28 Mar 2026 - 11:03
#real-analysis
#analysis
#measure-theory
#examples-counterexamples
#supremum-and-infimum
250
Views
MSE for estimator of dependent Bernoulli random variables
Published on
24 Sep 2019 - 20:43
#probability
#examples-counterexamples
57
Views
The Airy functions and miscellaneous sequences of odd integers without repeated prime factors
Published on
27 Mar 2026 - 0:59
#elementary-number-theory
#examples-counterexamples
#integers
#prime-factorization
#ceiling-and-floor-functions
330
Views
Continuity in $X$ and continuous in $Y$ but not continuous in $X \times Y$
Published on
28 Sep 2019 - 13:41
#general-topology
#continuity
#examples-counterexamples
212
Views
Example of an additive map $\mathcal{O}_X \to \mathcal{O}_X$ that is not a differential operator on a Scheme $X$.
Published on
25 Mar 2026 - 6:29
#algebraic-geometry
#examples-counterexamples
#schemes
#differential-operators
40
Views
Bijective single variable real functions which does not commute under composition
Published on
13 Mar 2014 - 13:57
#algebra-precalculus
#examples-counterexamples
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