13

Answers
votes newest views recent
10
Is it consistent with ZFC that for all ordinals $\alpha, \beta < \omega$ it holds that $2^{\aleph_\alpha} = 2^{\aleph_\beta}$?
5
Is the “closedness of the image of operator” needed in the defintion of Fredholm operators?
3
Adding a formal inverse of an element to a free monoid
6
Proof of Gödel incompleteness
4
Minimum enclosing rectangle of a convex polygon proof
5
Is there a “primitive-recursively enumerable” set whose complement is not such?
7
Most ‘unintuitive’ application of the Axiom of Choice?
2
Do the empty set AND the entire set really need to be open?
7
Results about the order of a group forcing a particular property.
2
When 2^a = 2^b implies a=b (a,b cardinals)
0
Inverse limit in metric geometry
7
Colloquial catchy statements encoding serious mathematics
12
Your favorite surprising connections in Mathematics