Reputation
1,272
Top tag
Next privilege 2,000 Rep.
Edit questions and answers
Badges
6 15
Newest
 Yearling
Impact
~37k people reached

  • 0 posts edited
  • 0 helpful flags
  • 102 votes cast
Feb
13
awarded  Yearling
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
10
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 Counting words of varying length made out of a restricted alphabet
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.