A
Anonymous01/27/26, 01:24No.16899914/mg/ — mathematics general
Hurewicz space edition
ITT: discuss mathematics
Previous: >>16876118 [/sci/thread/16876118#p16876118]
23
Replies
A
Anon01/27/26, 02:58No.16899933
>The Bonnet problem asks when just a bit of information is enough to uniquely identify a whole surface.
>For the first time, mathematicians have found an example of a compact doughnutlike surface (as seen above) that shares its local geometric information with another surface, despite having a completely different global structure.
https://www.quantamagazine.org/two-twisty-shapes-resolve-a-centuries-old-topology-puzzle-20260120/
A
Anon01/27/26, 04:07No.16899990
>Černý conjecture
Can /sci/ solve this open problem?
https://www.wikipedia.org/wiki/Synchronizing_word#Lenght
A
Anon01/27/26, 19:02No.16900313
Ah, Hurewicz...his depths of knowledge indeed matched with his adventurous spirit
A
Anon01/27/26, 21:04No.16900392
What's your favorite counter example
A
Anon01/29/26, 08:40No.16901094
How can I prove that there exists a subspace of a infinite dimensional vector space which is not closed?
I tried taking two convergent sequences and proving that their sum does not converge within the subspace, but that ain't working