Mathematics
StefanH
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stefuzius84 (at) web (dot) de

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21
With this definition of completeness, Gödel's Incompleteness result seems not surprising, so why it was back then?
Apr 6 '18
20
Can mathematics get from other sciences what it got from physics?
Jan 9 '15
16
Open Sets in Product Topology.
Jul 13 '13
12
The notation $\prod_{g\in G} g$ for a finite group not well-defined.
Feb 9 '13
11
Is there a difference between allowing only countable unions/intersections, and allowing arbitrary (possibly uncountable) unions/intersections?
Jun 25 '12
11
Let $X$ and $Y$ be Banach spaces, show that if they are isomorphic, then $X$ is reflexive iff $Y$ is reflexive.
Jan 6 '13
10
How are simple groups the building blocks?
Jan 30 '16
10
Axiom of Choice and Cartesian Products
Jan 2 '14
10
On the meaning of formal sums of $k$-cubes, i.e. $k$-chains (in integration on manifolds)
Apr 3 '16
10
Show that a semigroup with $aS \cup \{a\} = bS \cup \{b\}$ and $Sa \cup \{a\} = Sb \cup \{b\}$ is a group
Jul 31 '18
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33
Why do people with perfect pitch perceive tunes not in 440 Hz out of tune?
17
Why are regular expressions defined with union, concatenation and star operations?
16
Theoretical Question about "Smoke On The Water"
14
On the realisation of monoids as syntactic monoids of languages
12
Using a fidget spinner to rotate in outer space

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