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  • 12 votes cast
Mar
28
accepted How does equality in Bessel's Inequality prove an orthonormal complete sequence?
Mar
27
asked How does equality in Bessel's Inequality prove an orthonormal complete sequence?
Mar
19
comment How to derive the discrete fourier transform of $(n+2)a^nu[n]$ where $|a| < 1$?
Well, that is certainly some trickery, but it works. Thanks!
Mar
19
asked How to derive the discrete fourier transform of $(n+2)a^nu[n]$ where $|a| < 1$?
Feb
16
asked Is the following a subspace, where $f(t) \in C^{1}[0,1]$?
Feb
16
accepted Can this equation, $Ax=b$ ever have a unique solution where A is a $3x4$ matrix?
Feb
15
revised Can this equation, $Ax=b$ ever have a unique solution where A is a $3x4$ matrix?
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Feb
15
asked Can this equation, $Ax=b$ ever have a unique solution where A is a $3x4$ matrix?
Jan
31
accepted What values of $a$ and $b$ does this system have infinitely many solutions?
Jan
31
comment What values of $a$ and $b$ does this system have infinitely many solutions?
Yep, you're right. I have a $b^{2}$ where it should be $b$ in $a_{34}$. Thanks. Must have done one too many problems today.
Jan
31
comment What values of $a$ and $b$ does this system have infinitely many solutions?
That is also one way to check, but that could also imply there are no solutions. I don't believe it guarantees that there are infinite solutions.
Jan
31
asked What values of $a$ and $b$ does this system have infinitely many solutions?
Jan
25
accepted Why is the CT system $y(t)=x(2t)$ invertible but its DT counterpart non-invertible?
Jan
25
comment Why is the CT system $y(t)=x(2t)$ invertible but its DT counterpart non-invertible?
Makes sense, thanks.
Jan
25
comment Why is the CT system $y(t)=x(2t)$ invertible but its DT counterpart non-invertible?
That's a good way of thinking about it - there's no way to recover the values of $x$ at odd $n$. Still, I'm mulling over the difference between the CT and DT counter-examples.
Jan
25
asked Why is the CT system $y(t)=x(2t)$ invertible but its DT counterpart non-invertible?
Dec
15
awarded  Notable Question
Sep
29
awarded  Yearling
Jul
2
awarded  Curious
Apr
14
revised What is the conditional mass function of $X$ given that $Y = i$?
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