9

Questions
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2
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2
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439
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A characterization of Hilbert spaces?

may 12 at 22:16 Sergei Ivanov 22.3k●45●94

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7
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0
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200
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Can a composition with itself of a universal self-map be non-universal?

may 16 at 6:42 Wlodzimierz Holsztynski 874●4●7

 
4
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2
answers
197
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Are sums of the inverses of prime siblings finite?

2d ago Wlodzimierz Holsztynski 874●4●7

 
3
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0
answers
154
views

Construct a topologically $\infty$-dimensional separable metric space.

feb 16 at 9:06 Wlodzimierz Holsztynski 874●4●7

 
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0
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106
views

Is there a better function (linear or even a projection)?

may 19 at 5:41 Wlodzimierz Holsztynski 874●4●7

 
1
vote
1
answer
100
views

General and translational Birkhoff lattices. Equational classes.

may 17 at 1:33 Wlodzimierz Holsztynski 874●4●7

 
3
votes
2
answers
91
views

$2$-colorings of triangles, resulting in $(2\ 2)$-colorings of all tetrahedra

feb 16 at 20:37 Wlodzimierz Holsztynski 874●4●7

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5
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0
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72
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Do operations generate well-ordered sets only?

2h ago Wlodzimierz Holsztynski 874●4●7

 
1
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0
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54
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What are the minimal numbers of $(2\ 2)$-tetrahedra?

feb 20 at 6:15 Wlodzimierz Holsztynski 874●4●7