1,242 reputation
515
bio website
location Tromsø, Norway
age 23
visits member for 3 years, 10 months
seen Dec 9 at 15:07

Studying mathematics at the University of Tromsø.


Jul
2
awarded  Curious
Feb
13
awarded  Yearling
Sep
29
awarded  Popular Question
Feb
13
awarded  Yearling
Nov
18
awarded  Nice Answer
Jun
8
awarded  Constituent
Jun
8
awarded  Caucus
Feb
13
awarded  Yearling
Jan
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awarded  Announcer
Aug
3
comment Find equation for a function of form: $f(x) = Ae^{kx} \cos(Bx+C)+D.$?
$D$ is the function value when $\cos{(Bx+C)} = 0$. Since the function has a maximum at $0$, $C = 0$. You can find $B$ by finding the period of the function. At each maximum $\cos (Bx+C)$ = 1, so $Ae^{kx}$ decides the height at the maximums.
Aug
3
answered $u$-substitution into integral
Jun
23
accepted Distinction between vectors and points
Jun
17
answered Why do we take a derivative?
Jun
17
comment Distinction between vectors and points
Thank you. This helps a lot.
Jun
17
comment Distinction between vectors and points
@Qiaochu: They started the first chapter by saying that they would use bold face for vectors. Therefore I assumed that the point $\textbf x$ is also a vector.
Jun
17
comment Distinction between vectors and points
Thank you. I have not heard about affine spaces before, but what you say makes sense to me.
Jun
17
comment Distinction between vectors and points
@Qiaochu: It may be a little unclear. What I mean is that they call it a point and use vector notation (bold face).
Jun
17
asked Distinction between vectors and points
Jun
16
comment Combinatorics Question
It's not a permutation. In a permutation, the number of objects is kept constant. You have the same number of objects (and also the same objects) before you permute as after.
Jun
5
comment Linear Algebra: solution of homogeneous system of equation
From the matrix equation we get $0 \cdot x_1 = 0$, so the equation will hold for any $x_1$.