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# Questions

1
-3
3
503
views

### Where is the belly button of the Universe? [closed]

may 25 at 3:47 Charles Staats 4,18912047

1
11
2
542
views

### Anything special (historical?) about surface $x\cdot y\cdot z\ +\ x+y+z=0$?

may 26 at 0:43 Joseph O'Rourke 44.1k150216

8
14
5
1k
views

### Why did Bourbaki ignore the theory of categories? [closed]

may 24 at 23:25 Wlodzimierz Holsztynski 1,214512

4
10
2
256
views

### Do operations generate well-ordered sets only?

may 23 at 14:29 Emil Jeřábek 10.8k12742

4
2
224
views

### Are sums of the inverses of prime siblings finite?

may 21 at 7:39 Wlodzimierz Holsztynski 1,214512

1
vote
1
105
views

### General and translational Birkhoff lattices. Equational classes.

may 17 at 1:33 Wlodzimierz Holsztynski 1,214512

2
7
0
214
views

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

may 16 at 6:42 Wlodzimierz Holsztynski 1,214512

2
2
2
456
views

### A characterization of Hilbert spaces?

may 12 at 22:16 Sergei Ivanov 22.8k4695

0
0
112
views

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

may 19 at 5:41 Wlodzimierz Holsztynski 1,214512

1
vote
0