Skip to main content
Mathematics
Hanno's user avatar
Hanno's user avatar
Hanno's user avatar
Hanno
  • Member for 8 years, 5 months
  • Last seen this week
  • Europe
Profile Activity
Stats
6,528
reputation
208k
reached
193
answers
21
questions
Communities
View all
About

$\exists\:$ another solution $\:\big|\:$ Someone shall present it.
"It is better to solve one problem five different
ways, than to solve five problems one way."
George Pólya (1887 - 1985)

$\exists\:$ something $\:\big|\:$ I've overlooked it.
"The Art of being wise is the Art of knowing what to overlook."
William James (1842 - 1910)

An answer of mine, regarding Kaprekar's constant $6174$
Quite happy with it, despite still being incomplete.

( This profile is written for math.SE, but Stack Exchange plainly copies it over to other sites.
$\;$ Where it makes less sense. )

Badges
View all badges
1
gold badge
20
silver badges
50
bronze badges
Top tags
View all tags
136
Score
71
Posts
33
Posts %
87
Score
33
Posts
15
Posts %
51
Score
36
Posts
17
Posts %
44
Score
36
Posts
17
Posts %
34
Score
30
Posts
14
Posts %
32
Score
22
Posts
10
Posts %
Top posts
View all questions and answers
29
The relation between trace and determinant of a matrix
Jan 6, 2017
15
The inequality $\,2+\sqrt{\frac p2}\leq\sum\limits_\text{cyc}\sqrt{\frac{a^2+pbc}{b^2+c^2}}\,$ where $0\leq p\leq 2$ is: Probably true! Provably true?
Mar 19, 2021
11
If $f(x)=x^2$, then what is $f(\emptyset)\,?$
Feb 11, 2017
10
SOS: Proof of the AM-GM inequality
Apr 21, 2017
10
How does one prove the determinant inequality $\det\left(6(A^3+B^3+C^3)+I_{n}\right)\ge 5^n\det(A^2+B^2+C^2)$?
Jan 18, 2020
9
Shortest paths in the Hypercube
May 30, 2017
8
Prove that the polar decomposition of normal matrices, $A=SU$, is such that $SU=US$
Dec 13, 2018
8
Does $\mathcal{B}(\mathcal{H})=\mathcal{H}\otimes\mathcal{H}^*$ in infinite dimensions?
Mar 29, 2018
6
Prove that the product of two positive linear operators is positive if and only if they commute.
Oct 10, 2018
5
How to evaluate $\int _{-\infty }^{\infty }\!{\frac {\cos \left( x \right) }{{x}^{4}+1}}{dx}$
May 15, 2016
Top Meta posts
1
0
13
Accepting one answer if several answers form a partition of a full answer
Top network posts
View all network posts
29
Wanted: Positivity certificate for the AM-GM inequality in low dimension
8
Checkmating the bare king with 3 knights – can the mate be forced on any edge square?