424 reputation
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location France
age 20
visits member for 2 years, 7 months
seen Jan 18 at 15:32

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
Dec
23
awarded  Teacher
Dec
23
asked Union and intersections
Oct
26
comment How to determine the intersection of 6 planes?
Oh, I didn't know :) I'm not english ! Thank you.
Oct
26
comment How to determine the intersection of 6 planes?
I'm watching this tonight but your second link seems dead...