Reputation
3,528
Top tag
Next privilege 5,000 Rep.
Approve tag wiki edits
Badges
1 8 33
Newest
 Nice Answer
Impact
~91k people reached

Oct
5
awarded  Custodian
Sep
30
awarded  Explainer
Sep
23
comment Why is the polynomial $f(x)=x^3+x^2+x+1$ monotonic?
You can upvote all relevant, and accept (and also upvote) the one that suits you best
Sep
22
comment Prove that $f(x)=x^4+8x^3+x^2+2x+5$ is irreducible in $\mathbb Q[x]$
Do you know the rational root test?
Aug
8
revised How many $4$ digit even numbers have all $4$ digits distinct?
added 1 character in body
Jul
2
awarded  Curious
Jul
1
answered If $X$ is distributed normally with mean $0$, is it correct to say $X$ and $-X$ “have the same distribution”?
May
15
awarded  Yearling
May
10
answered How find a example such this set condition?
May
2
comment Calculating this integral: $I=\int_{0}^{\infty}(\log t)\,(\tan^2t)\,\mathrm{d}t$
You have bounds $0$ and $\infty$ in the title but some other numbers in the body, which is it?
Apr
11
revised Minimum number of combinations
added 974 characters in body
Apr
11
answered Minimum number of combinations
Apr
10
comment Help with this combinatorial proof $\sum\limits_{k=1}^nk^2(k-1){n\choose k}^2 = n^2(n-1){2n-3\choose n-2}$ considering $n\ge2$
Where did you get this formula? left-hand side gives $480$ and right hand side gives $160$ for $n=4$...
Apr
10
comment What does this equal? $6\div 2(1+2)$
how does someone get $7$?
Apr
10
reviewed Approve Sudoku candidate probability
Apr
10
comment Are the two integrals equivalent?
Yes they are indeed the same
Apr
9
reviewed Edit Is my second equation right?
Apr
9
revised Is my second equation right?
Use Mathjax
Apr
9
reviewed Approve How to use the Maclaurin Series to get $f^{10}(0)$ of $f(x)=(\cos(3x^2)−1)/x^2$
Apr
9
revised Convert from base 10 to base 5
improved formatting