429 reputation
311
bio website
location France
age 20
visits member for 3 years, 1 month
seen Oct 8 at 18:57

Jan
27
asked Unique local extremum
Jan
14
comment Proof that $e=\sum\limits_{k=0}^{+\infty}\frac{1}{k!}$
Okay @JimConant, I give him the points !
Jan
14
accepted Proof that $e=\sum\limits_{k=0}^{+\infty}\frac{1}{k!}$
Jan
14
comment Proof that $e=\sum\limits_{k=0}^{+\infty}\frac{1}{k!}$
I am not thinking you misbehaved. The last time I gave the points to another person after I accepted an answer, I got a rocket so I don't know if I should do it or not.
Jan
14
comment Proof that $e=\sum\limits_{k=0}^{+\infty}\frac{1}{k!}$
I gave you a +1 but I won't unaccept an answer, that's not a nice behavior. Thank you anyway !
Jan
14
comment Proof that $e=\sum\limits_{k=0}^{+\infty}\frac{1}{k!}$
Thank you for the answer !
Jan
14
comment Proof that $e=\sum\limits_{k=0}^{+\infty}\frac{1}{k!}$
@mt_ Of course, I forgot it. Neal, I'll read about this now, thank you !
Jan
14
comment Proof that $e=\sum\limits_{k=0}^{+\infty}\frac{1}{k!}$
The only solution of the differential equation $y'=y$ where $y'$ is the derivative of $y$
Jan
14
comment Proof that $e=\sum\limits_{k=0}^{+\infty}\frac{1}{k!}$
The exponential function.
Jan
14
comment Proof that $e=\sum\limits_{k=0}^{+\infty}\frac{1}{k!}$
@mt_ $e=\exp(1)$. Alex I'll take a look at it.
Jan
14
asked Proof that $e=\sum\limits_{k=0}^{+\infty}\frac{1}{k!}$
Dec
26
accepted Union and intersections
Dec
26
comment Union and intersections
Thank you ! I think I've found the second one.
Dec
25
comment Union and intersections
Okay, I've managed to conclude I think :) Now, what should I prove first for the second problem to conclude it in a similiar way ? I've tried to found it out but definitely can't understand where this comes from... Thank you in advance !
Dec
23
comment Union and intersections
Thank you a lot :) I'm trying to solve the second now !
Dec
23
comment Union and intersections
For the first problem, I can't see why the cardinality of J can lead to $P \subset Q$ that's to say in fact $x \in Q$
Dec
23
comment Union and intersections
I don't understand how you deduce there are at most $k-1$ different $i\in\{1,\dots,n\}$ with $i\not\in X_i$. But then ok, this proves what Davide said in his comment on the question with the J set and I don't know how this helps with the final deduction. Moreover, I can't suppose k is small relative to n I think ?
Dec
23
revised Union and intersections
added 8 characters in body
Dec
23
comment Union and intersections
Right, I made a little mistake when writing the question. I have changed it !
Dec
23
awarded  Commentator