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Frentos
  • Member for 6 years, 5 months
  • Last seen more than a month ago
  • Australia
394 votes
1 answer
16k views

The Ring Game on $K[x,y,z]$

  • 58.3k
120 votes
6 answers
59k views

lim sup and lim inf of sequence of sets.

106 votes
19 answers
19k views

Chatting about mathematics (with real-time LaTeX rendering)

87 votes
5 answers
3k views

How to solve these two simultaneous "divisibilities" : $n+1\mid m^2+1$ and $m+1\mid n^2+1$

  • 717
82 votes
1 answer
2k views

In $n>5$, topology = algebra

73 votes
2 answers
3k views

Representing every positive rational number in the form of $(a^n+b^n)/(c^n+d^n)$

  • 122k
70 votes
2 answers
2k views

Let, $A\subset\mathbb{R}^2$. Show that $A$ can contain at most one point $p$ such that $A$ is isometric to $A \setminus \{p\}$.

  • 5,402
67 votes
13 answers
10k views

Are proofs by contradiction really logical?

  • 675
55 votes
3 answers
8k views

Is there a purely algebraic proof of the Fundamental Theorem of Algebra?

48 votes
3 answers
4k views

Can commuting matrices $X,Y$ always be written as polynomials of some matrix $A$?

46 votes
8 answers
4k views

$-1$ as the only negative prime.

41 votes
2 answers
6k views

Can proof by contradiction 'fail'?

  • 9,204
31 votes
6 answers
3k views

Embedding ordinals in $\mathbb{Q}$

  • 1,550
26 votes
1 answer
1k views

Is there any palindromic power of $2$?

  • 22.7k
16 votes
1 answer
416 views

Show there is an uncut square lying in a larger square cut by lines

  • 1,155
12 votes
2 answers
271 views

Infinitely many polygons, no four have a common point

  • 1,236
12 votes
5 answers
5k views

Fast way to get a position of combination (without repetitions)

  • 323
12 votes
1 answer
424 views

Polyhedra with identical faces

  • 19.4k
12 votes
1 answer
1k views

What are some Group representation of the rubik's cube group?

  • 9,520
12 votes
2 answers
722 views

How Does One Begin to Read Mathematical Journals and Papers? [closed]

  • 2,313
11 votes
4 answers
6k views

Is there any algorithm to find Isomorphism function between two graphs?

  • 3,798
11 votes
2 answers
3k views

Possible all-Pentagon Polyhedra

  • 19.4k
10 votes
2 answers
373 views

Pedagogical examples of distinguishing "types of symmetry"

  • 14.6k
10 votes
1 answer
243 views

Smallest square containing sectors of disc

  • 31.1k
9 votes
1 answer
3k views

An Analogue of Chinese Remainder Theorem for Groups

  • 1,101
9 votes
2 answers
2k views

Why are the elements of a galois/finite field represented as polynomials?

9 votes
0 answers
262 views

Looking for the most elementary proof that $48X^4+12X^2+1=Y^2$ has no non-trivial integer solution.

8 votes
2 answers
440 views

Urn Probability Problem (conditional replacement)

7 votes
2 answers
1k views

Defining vertical tangent lines

  • 26.1k
7 votes
2 answers
323 views

Can $10^n+89$ ever be a Perfect Square for $n>3$?

  • 1,028
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