712 reputation
316
bio website stackoverflow.com/users/…
location Netherlands
age 18
visits member for 2 years, 5 months
seen 20 hours ago

Programmer, math lover, student.


Nov
19
comment Differentiability of a function on $\mathbb R$ such that $f(x+1)=f(x)$.
I bet you meant "Finally, (c) is clearly false."?
Nov
5
revised Inequality proof by induction, what to do next in the step
corrected spelling
Nov
5
comment Inequality proof by induction, what to do next in the step
It's not extremely easy to see that $$2\left(\sqrt{n+2}-\sqrt{n+1}\right) = \frac{2}{\sqrt{n+2}+\sqrt{n+1}},$$ though.
Nov
5
answered Inequality proof by induction, what to do next in the step
Sep
30
awarded  Explainer
Jul
2
awarded  Curious
Jun
25
awarded  Yearling
Feb
3
awarded  Good Answer
Nov
20
revised Prove that $ \sum_{1 \le t \le n, \ (t, n) = 1} t = \dfrac {n\phi(n)}{2} $
Removed \displaystyle in the title.
Nov
20
suggested suggested edit on Prove that $ \sum_{1 \le t \le n, \ (t, n) = 1} t = \dfrac {n\phi(n)}{2} $
Oct
19
comment Let $T : V \rightarrow V$ be a linear operator. If $T^n = O_V$ for some $n \ge 1$, prove that $I_V + T$ is an isomorphism.
Hint: use \left( and \right) for larger brackets when using exponents.
Oct
19
answered There are 10 different people at a party. How many ways are there to pair them off into a collection of five pairings?
Sep
22
comment How do I simplify $p^8-Q^8$?
Though this is probably what's intended, I'm not sure if factoring symplifies it.
Aug
27
comment Extending primes
Right, but then $73939133$ obviously is not the biggest prime you'll yield.
Aug
27
comment Extending primes
I guess the prime you start with can only have one digit?
Aug
19
accepted Proving there are no integer solutions for $3x^2=9+y^3$
Aug
19
comment Proving there are no integer solutions for $3x^2=9+y^3$
Thanks. I would never write a proof like my second one here on an actual contest or exam, but I've seen proofs to other problems that don't go into much detail at all (which I tried to mimic with my second proof).
Aug
15
comment How many ways can $2m$ be represented as the sum of 4 natural numbers $\le m$?
Is this homework? Then please add the homework tag. Also, could you quote the original problem word for word? The question as it is now is a bit vague.
Aug
15
comment team needs 14 runs to win
@mathslover Generatingfuctionology is pretty good.
Aug
14
comment the partial derivative of $f(x,y)=\ln(x+\sqrt{x^2+y^2}), f_x (3,4)$
That's weird, I use it the most. :-------------)