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