Chad Groft's user avatar
Chad Groft's user avatar
Chad Groft's user avatar
Chad Groft
  • Member for 14 years, 1 month
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22 votes

Your favorite surprising connections in mathematics

17 votes

Most 'unintuitive' application of the Axiom of Choice?

12 votes

Results about the order of a group forcing a particular property.

11 votes
Accepted

Minimum enclosing rectangle of a convex polygon has a collinear side

11 votes

Is it consistent with ZFC that for all ordinals $\alpha, \beta < \omega$ it holds that $2^{\aleph_\alpha} = 2^{\aleph_\beta}$?

9 votes

Is the "closedness of the image of operator" needed in the defintion of Fredholm operators?

8 votes
Accepted

Is there a "primitive-recursively enumerable" set whose complement is not such?

7 votes

Proof of Gödel incompleteness

7 votes

Colloquial catchy statements encoding serious mathematics

3 votes

Adding a formal inverse of an element to a free monoid

3 votes

Why is a Boolean algebra being $\kappa$-saturated upward closed in $\kappa$?

2 votes

When $2^\alpha = 2^\beta$ implies $\alpha=\beta$ ($\alpha,\beta$ cardinals)

2 votes

Do the empty set AND the entire set really need to be open?

0 votes

Inverse limit in metric geometry