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Conifold
  • Member for 8 years, 1 month
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18 votes
2 answers
912 views

Are there non-standard counterexamples to the Fermat Last Theorem?

17 votes
1 answer
670 views

Are there spaces that 'look the same' at every point, but are not homogeneous?

13 votes
2 answers
1k views

Why do we know that Gödel sentences are true in the standard model of set theory, but do not know if the continuum hypothesis is?

13 votes
2 answers
454 views

Is Archimedes's method for computing volumes equivalent to Cavalieri's?

11 votes
1 answer
2k views

What is the reflection across a parabola?

11 votes
1 answer
223 views

Is there a clever way to find a smaller number that produces the Euclidean algorithm of given length?

10 votes
3 answers
57k views

Are triangles the strongest shape?

9 votes
2 answers
382 views

How many different products can be formed by multiplying $n$ numbers at most once?

7 votes
2 answers
1k views

What is the multiplicative order of a product of two integers $\mod n$?

7 votes
1 answer
781 views

Why is the powerset axiom more acceptable than the axiom of choice?

7 votes
1 answer
3k views

Functions with every point being a Lebesgue point

6 votes
1 answer
590 views

Partial order on cardinalities without the axiom of choice

6 votes
1 answer
412 views

Is there a theory of integration in elementary terms for definite integrals?

6 votes
1 answer
384 views

How do inconsistent arithmetics get around Gödel incompleteness?

6 votes
1 answer
687 views

Circle inversion and the Pappus chain paradox

5 votes
1 answer
350 views

Are all rationally parametrized plane curves algebraic? How does one find their degree?

5 votes
2 answers
374 views

Can one prove existence of incommensurables without the Pythagorean theorem?

5 votes
1 answer
539 views

Finding covering system of congruences with prescribed moduli

4 votes
0 answers
158 views

Can existence of aleph one be proved without the power set axiom? [duplicate]

4 votes
1 answer
1k views

What is the dual space in the strong operator topology?

4 votes
1 answer
72 views

How many integer matrices have spectral radius bounded by a constant?

3 votes
1 answer
706 views

Can hyperreal numbers be studied 'naively', like surreal numbers?

3 votes
1 answer
278 views

Banach valued sequence spaces $\ell^p(X)$

3 votes
0 answers
92 views

Is there an intuitive reason why hippopede, the intersection curve of a sphere and a cylinder, is traced by composing two rotational motions?

2 votes
1 answer
393 views

Are order isomorphic real closed fields isomorphic?

0 votes
1 answer
122 views

Is there a formalisation of set theory where unions can be taken over some classes that are not a priori known to be sets?

0 votes
1 answer
206 views

Non-convex functions and their supporting hyperplanes