Garabed Gulbenkian's user avatar
Garabed Gulbenkian's user avatar
Garabed Gulbenkian's user avatar
Garabed Gulbenkian
  • Member for 14 years
  • Last seen more than 6 years ago
31 votes
3 answers
6k views

Is there a good argument for why you can't place 4 queens which cover a chessboard?

43 votes
2 answers
6k views

A question about ordinal definable real numbers

48 votes
5 answers
5k views

Is Lebesgue's "universal covering" problem still open?

9 votes
2 answers
3k views

A question about Second-Order ZFC and the Continuum Hypothesis

3 votes
2 answers
3k views

What is the smallest cardinal number of a set that requires the axiom of choice to prove that it exists and is non-empty?

2 votes
3 answers
2k views

A question about compact subsets of Hilbert space

11 votes
2 answers
2k views

The status of 'the consistency of NF relative to ZF'

9 votes
4 answers
2k views

A question about J.H. Conway's SURREAL NUMBERS

7 votes
2 answers
2k views

A question about fields of real numbers

20 votes
3 answers
1k views

How thinly connected can a closed subset of Hilbert space be?

0 votes
2 answers
1k views

Two questions about Convex Sets and Lebesgue Measure

1 vote
1 answer
1k views

A question about unbounded connected subsets of the plane.

9 votes
2 answers
1k views

A question about the Osgood curve

8 votes
4 answers
1k views

Does there exist a non-trivial Ultrafinitist set theory?

8 votes
1 answer
1k views

A question about the Axiom of Choice

5 votes
2 answers
1k views

Is this a "folk theorem" about analytic functions of a complex variable?

5 votes
2 answers
999 views

A question about Universal sets.

3 votes
1 answer
931 views

A question about supercompact cardinal numbers

5 votes
2 answers
926 views

A question about large cardinal axioms.

3 votes
1 answer
922 views

A question about Cantor's Power Set theorem without the Axiom of Choice

13 votes
2 answers
915 views

Can the circle be characterized by the following property?

6 votes
5 answers
912 views

A question about local connectedness in metric spaces

4 votes
1 answer
906 views

A question about "local" versus "global" large cardinal axioms

5 votes
2 answers
880 views

A question about "small" uncountable cardinal numbers

2 votes
2 answers
855 views

A couple of questions about Turing machines that are bounded in space but have an infinite amount of time in which to operate [closed]

2 votes
2 answers
833 views

A question about formulating first order axioms for group theory.

6 votes
2 answers
795 views

A question about well ordered subsets of totally ordered countable sets

4 votes
4 answers
774 views

A question about the Axiom of Choice and straight lines in the Euclidean plane.

8 votes
1 answer
773 views

A question about Quine's set theory NF.

-1 votes
3 answers
732 views

A question about sentences undecidable in Peano's Arithmetic

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