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Watson
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Homo Mathematicus

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— More unsolved questions : (3), (4) and (5) —

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35
Non-abelian group with infinitely many abelian subgroups
Jun 16, 2016
29
Is there any perfect square in the sequence $12,123,1234,12345,...$?
Aug 24, 2016
27
Is there any palindromic power of $2$?
Feb 13, 2016
26
If $A[X] \cong B[X]$ as rings, are the degrees of irreducible polynomials the same in $A$ and in $B$?
Jul 25, 2016
25
Do there exist numbers normal in every base except for one?
Sep 25, 2016
22
Does $A^2 \cong B^2$ imply $A \cong B$ for rings?
Jul 24, 2016
21
Quotient ring of Gaussian integers $\mathbb{Z}[i]/(a+bi)$ when $a$ and $b$ are NOT coprime
Jul 23, 2016
21
How do you simplify this square root of sum: $\sqrt{7+4\sqrt3}$?
Jun 16, 2016
20
Call a number "holy" if it contains no $666$ in its decimal expansion. Are there infinitely many holy powers of $2$?
Sep 29, 2019
20
Is there no formula for $\cos(x^2)$?
Feb 4, 2016
Top Meta posts
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Which question on MSE has the most failed attempts?
4
What can I do to find a post I saw earlier today?
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51
Is there a notion of polynomial ring in "one half variable"?
29
Is there a field $F$ which is isomorphic to $F(X,Y)$ but not to $F(X)$?
20
Curves over number fields with everywhere good reduction
16
Diagonal brace with nested parenthesis
15
Torsion-free abelian group $A$ such that $A \not \simeq A \oplus \Bbb Z \simeq A \oplus \Bbb Z^2$