Mathematics

Associated with Math.SE; for both general discussion & math qu...
Sep 3, 2017 20:35
Quick question
is $\lim_{x \to \infty} e^{-x} = 0$ ?
Sep 3, 2017 20:34
Hey
Jul 27, 2017 22:40
@TedShifrin I passed the algebra exam !!
Jul 23, 2017 05:21
@Daminark Yep :)
Jul 23, 2017 05:21
@Daminark Yep
Jul 23, 2017 05:10
thanks !
Jul 23, 2017 05:10
Will try
Jul 23, 2017 05:10
where $f$ is any element of $W*$
Jul 23, 2017 05:09
Oh, ok
Jul 23, 2017 05:08
where did $f : W \to F$ come from ?
Jul 23, 2017 05:04
@Daminark Go on
Jul 23, 2017 05:01
I dont get why it involves the dual space here
Jul 23, 2017 05:01
In linear algebra, the transpose of a matrix is an operator which flips a matrix over its diagonal, that is it switches the row and column indices of the matrix by producing another matrix denoted as AT (also written A′, Atr, tA or At). It is achieved by any one of the following equivalent actions: reflect A over its main diagonal (which runs from top-left to bottom-right) to obtain AT write the rows of A as the columns of AT write the columns of A as the rows of AT Formally, the i th row, j th column element of AT is the j th row, i th column element of A: ...
Jul 23, 2017 05:01
Yeag
Jul 23, 2017 04:55
prove that the inverse and the transpose of $T$ both are linear transformations
Jul 23, 2017 04:55
Its actually a proof
Jul 23, 2017 04:55
That was the question
Jul 23, 2017 04:47
$T'$ on one hand, and the inverse on the other
Jul 23, 2017 04:47
@Daminark Oh no no, those were to different statements
Jul 23, 2017 04:47
:38953549 I saw that
Jul 23, 2017 04:45
why wouldn't it be?
Jul 23, 2017 04:45
It appears to be
Jul 23, 2017 04:43
$T^{-1}$ is also a linear transformation
Jul 23, 2017 04:43
$T'$ is a linear transformation
Jul 23, 2017 04:43
Given $T \in L(V,W)$
Jul 23, 2017 04:42
but I dont understand it
Jul 23, 2017 04:42
Which I found the answer
Jul 23, 2017 04:42
I have another one
Jul 23, 2017 04:42
Haha
Jul 23, 2017 04:42
found it
Jul 23, 2017 04:42
Nevermind
Jul 23, 2017 04:42
Eigen vectors associated to different eigen values are LI
Jul 23, 2017 04:41
Could you help me find the proof of a theorem ?
Jul 23, 2017 04:41
@Semiclassical
Jul 21, 2017 21:15
Thanks @TedShifrin :D
Jul 21, 2017 21:13
$ b + c + d = 0$
$ ax = x$
Then $b = 1, a = 1, c = 0$ and $d = -1$
Jul 21, 2017 21:12
Ups, dont know where that one came from
$a - c + d = 0$
Jul 21, 2017 21:09
well , $b = 1$ and $a - c + d = 1$
Jul 21, 2017 21:07
$ax - cx + dx = 0$ and $by = y$ that's what you mean ?
Jul 21, 2017 21:05
I'm sorry, my english got a bit rusty D:
Jul 21, 2017 21:05
Do you mean for which values of $a,b,c,d$ the equation has sense ?
Jul 21, 2017 21:03
I have to think a different aproach then
Jul 21, 2017 21:03
Yeah, I get it now
Jul 21, 2017 21:01
@TedShifrin what is the flaw in my logic ?
Jul 21, 2017 21:01
@Te
Jul 21, 2017 20:56
why not ?
Jul 21, 2017 20:56
My variables are $a,b,c,d$
Jul 21, 2017 20:56
Oh, that's the problem
Jul 21, 2017 20:56
$\begin{bmatrix}
x & y & -x & x & y \\
x & y & y & y & x
\end{bmatrix}$
Jul 21, 2017 20:55
Basically
$ ax + by -cx +dx = y $
$ ax + by +cy +dy = x $