Loser66
  • Loser66
If A is an n x n matrix function such that A and \(\frac{dA}{dt}\)are the same function, then A = c\(e^tI_n\)for some constant c. True or false? why? Please, help
Mathematics
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SOLVED
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jamiebookeater
  • jamiebookeater
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klimenkov
  • klimenkov
If \(A=\left(\begin{matrix}e^{t} & 2e^{t} \\ 3e^{t}& 4e^{x}\end{matrix}\right)\), what is \(\frac{dA}{dt}\)?
Loser66
  • Loser66
\[\frac{dA}{dt}=A ~~but~~A\neq ce^tI_n\]therefore, it's false, right?
Loser66
  • Loser66
@MayMay_69

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Loser66
  • Loser66
|dw:1377646939372:dw|
Loser66
  • Loser66
the area of ACDE = area ABE + area BCDE = AB *EB/2 + EB*BC = 4*4\(\frac{\sqrt{3}}{2}\)+4\(\sqrt{3}\)*11
Loser66
  • Loser66
since AB=4 , BC=11. got it? it is = 8\(\sqrt{3}\)+44\(\sqrt{3}\)=52\(\sqrt{3}\)
Loser66
  • Loser66
@MayMay_69 that's yours. Take it, I am gonna delete it.
Loser66
  • Loser66
@oldrin.bataku am I right for my own problem?
Loser66
  • Loser66
I am sorry for messing up. May may asked for help but he/she has no link, I used my post to anser him/her
anonymous
  • anonymous
@Loser66 @klimenkov gave a counterexample :-p
Loser66
  • Loser66
that means the answer is "False" right?
anonymous
  • anonymous
it need not be \(A=ce^tI_n\) merely \(A=e^tB\) for constant matrix \(B\)
anonymous
  • anonymous
correct
Loser66
  • Loser66
thank you very much. @oldrin.bataku
anonymous
  • anonymous
okay thank you very very much loser
Loser66
  • Loser66
You got what I mean, right? @MayMay_69
anonymous
  • anonymous
yes I did thank you
Loser66
  • Loser66
yw

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