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

16h ago Wlodzimierz Holsztynski 772●4●7

 
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98
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General and translational Birkhoff lattices. Equational classes.

2d ago Wlodzimierz Holsztynski 772●4●7

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196
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Can a composition with itself of a universal self-map be non-universal?

may 16 at 6:42 Wlodzimierz Holsztynski 772●4●7

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437
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A characterization of Hilbert spaces?

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

 
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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 772●4●7

 
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2
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83
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$2$-colorings of triangles, resulting in $(2\ 2)$-colorings of all tetrahedra

feb 16 at 20:37 Wlodzimierz Holsztynski 772●4●7

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

feb 16 at 9:06 Wlodzimierz Holsztynski 772●4●7