Reputation
2,106
Top tag
Next privilege 2,500 Rep.
Create tag synonyms
Badges
11 16
Newest
 Yearling
Impact
~22k people reached

Feb
11
reviewed Approve There are two buckets A and B.
Dec
9
reviewed Edit Finding a matrix knowing determinant
Dec
9
revised Finding a matrix knowing determinant
edited body
Dec
7
reviewed Approve Joint Likelihood
Nov
28
revised On a generalization for $\sum_{d|n}rad(d)\phi(\frac{n}{d})$ and related questions
added 1275 characters in body
Nov
27
answered On a generalization for $\sum_{d|n}rad(d)\phi(\frac{n}{d})$ and related questions
Nov
27
reviewed Edit Solve the pde : $x^2(y-z)\,\partial_x(z)+y^2(z-x)\,\partial_y(z)=z^2(x-y)$
Nov
27
revised Solve the pde : $x^2(y-z)\,\partial_x(z)+y^2(z-x)\,\partial_y(z)=z^2(x-y)$
mathjax and typo
Nov
27
reviewed Approve Finding mass of a sphere given density = $1-\rho^2$ and radius = 1
Nov
10
reviewed Reject Maximize sum of numbers subject to an upper bound of the sum of each of these numbers raised to an arbitrary power
Nov
10
comment Numbers $n$ whose prime factors are $2$ and $5$ if and only if $\sum_{k=1}^{rad(n)}\mu(k)k=0$?
For $n$ small n=10 is the only solution to $\sum_{k=1}^n \mu(k)k=0$. This means that $\sum_{k=1}^{\operatorname{rad}(n)} \mu(k)k=0$, for all the members of the sequence A033846 as they all have $\operatorname{rad}(n) = 10$. The term $\sum_{k=1}^{\operatorname{rad}(n)} k=0$ seems to be an error.
Nov
8
awarded  Yearling
Nov
5
awarded  Critic
Nov
5
awarded  Custodian
Nov
5
reviewed Approve Complex integration upper semi-circle $\int f(z)dz$ when $r>1$
Oct
21
awarded  number-theory
Oct
14
answered Finding $\sum_{i = 1}^{n} \frac{n} { \gcd(i, n)}$
Oct
7
answered Is it possible to subtract a perfect square from another number to make it a perfect square?
Oct
5
answered Sanity check: prime ideals in number fields
Sep
24
revised Factorization in a Group
Added a reference and modification of the answer.