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15
Math.TechQA.Club
2026-04-12 15:51:24
2k
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A counterexample in topology
Published on
12 Apr 2026 - 15:51
#general-topology
#algebraic-topology
#examples-counterexamples
296
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A question on a quotient of Alexandroff's double segment space
Published on
15 Apr 2026 - 7:14
#general-topology
#examples-counterexamples
519
Views
Examples of preorders in which meets and joins do not exist
Published on
14 Apr 2026 - 7:42
#elementary-set-theory
#definition
#examples-counterexamples
#order-theory
1k
Views
non-residually finite group
Published on
11 Apr 2026 - 12:58
#group-theory
#examples-counterexamples
#hopfian
815
Views
A strongly pseudomonotone map that is not strongly monotone
Published on
16 Apr 2026 - 6:58
#real-analysis
#linear-algebra
#examples-counterexamples
#monotone-functions
2.5k
Views
A set that it is uncountable, has measure zero, and is not compact
Published on
11 Apr 2026 - 4:21
#real-analysis
#measure-theory
#examples-counterexamples
5.4k
Views
Example of application of the Uniform Boundedness Principle
Published on
13 Apr 2026 - 9:01
#functional-analysis
#examples-counterexamples
2.7k
Views
Every compact subset must be closed?
Published on
09 Apr 2026 - 20:36
#general-topology
#examples-counterexamples
#compactness
243
Views
Hilbert spaces other than $L^2$
Published on
15 Apr 2026 - 10:31
#measure-theory
#fourier-analysis
#hilbert-spaces
#examples-counterexamples
1.8k
Views
Accidents of small $n$
Published on
15 Apr 2026 - 15:33
#big-list
#examples-counterexamples
2.7k
Views
Applications of quadratic forms
Published on
15 Apr 2026 - 10:01
#big-list
#examples-counterexamples
#quadratic-forms
1.4k
Views
What is a metric for $\mathbb Q$ in the lower limit topology?
Published on
15 Apr 2026 - 3:43
#general-topology
#metric-spaces
#examples-counterexamples
1.6k
Views
What are the requirements for separability inheritance
Published on
09 Apr 2026 - 12:40
#general-topology
#reference-request
#examples-counterexamples
#separable-spaces
2.9k
Views
Pseudocompactness does not imply compactness
Published on
10 Apr 2026 - 14:39
#general-topology
#compactness
#examples-counterexamples
138
Views
What does the $A(m)$ denote in Engelking's book?
Published on
14 Apr 2026 - 20:00
#general-topology
#notation
#examples-counterexamples
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