user avatar
user avatar
user avatar
Favst
  • Member for 2 years, 5 months
  • Last seen this week
  • Toronto, ON, Canada
44 votes
9 answers
4k views

Is there a clever solution to Arnold's "merchant problem"?

13 votes
2 answers
2k views

What exactly is a contradiction and how does it differ from falsity?

9 votes
3 answers
490 views

Solving Dudeney's "A Question of Cubes": sum of consecutive cubes is a square

6 votes
0 answers
128 views

Why does the infinitude of primes of a certain form matter? [closed]

5 votes
2 answers
233 views

Is there a numeral system for real numbers that is always unique, but still has the usual convenient properties?

4 votes
2 answers
215 views

Unexpected formulas for "exactly $k$ sets" and "at least $k$ sets" variations of the principle of inclusion-exclusion

3 votes
1 answer
297 views

Is there a known formula for the number of $k^{\text{th}}$ power residues modulo $2^n$?

3 votes
0 answers
107 views

Is there a deeper reason for the classification of moduli in which a primitive root exists?

3 votes
1 answer
452 views

Sufficient criteria for proving convexity of a polygon

2 votes
1 answer
174 views

Comparing definitions of mutually exclusive: disjoint events or zero probability of intersection?

2 votes
2 answers
115 views

How is independence established and applied in probability?

2 votes
1 answer
74 views

Expected earliest point at which a sock matches an earlier sock

1 vote
1 answer
56 views

Conflicting definitions of the sum of random variables in proofs of additive property of expected value

1 vote
0 answers
66 views

Why do two ways of expanding the same formal polynomial lead to matching coefficients?

1 vote
1 answer
190 views

Existence of planar graph whose faces correspond to the faces of a convex polyhedron

1 vote
1 answer
64 views

Does a Jordan curve partition sufficiently small balls centered on it into an interior and exterior component

1 vote
1 answer
80 views

Why do we rotate the axes instead of rotating the conic?

1 vote
0 answers
86 views

What unifies modern geometry?

1 vote
3 answers
462 views

If a winning strategy does not exist for player 2, does it exist for player 1?

1 vote
1 answer
53 views

For which directed graphs does Pascal's recursive method work for finding the number of paths?

1 vote
2 answers
82 views

Example of $f,g:\mathbb{R}\to\mathbb{R}$ such that $f\circ g$ is bijective but $g\circ f$ is not bijective

0 votes
0 answers
17 views

How to formulate the symmetry in Ramsey's theorem for $c$ colours?

0 votes
1 answer
283 views

Conics: why is the eccentricity and focal parameter well-defined, and how to show uniqueness of foci and directrices

0 votes
3 answers
76 views

Bypassing the axiom of choice when there are infinitely many sets but there are constraints on the sets