Mlagma
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 Mar28 accepted How does equality in Bessel's Inequality prove an orthonormal complete sequence? Mar27 asked How does equality in Bessel's Inequality prove an orthonormal complete sequence? Mar19 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! Mar19 asked How to derive the discrete fourier transform of $(n+2)a^nu[n]$ where $|a| < 1$? Feb16 asked Is the following a subspace, where $f(t) \in C^{1}[0,1]$? Feb16 accepted Can this equation, $Ax=b$ ever have a unique solution where A is a $3x4$ matrix? Feb15 revised Can this equation, $Ax=b$ ever have a unique solution where A is a $3x4$ matrix? added 1 character in body Feb15 asked Can this equation, $Ax=b$ ever have a unique solution where A is a $3x4$ matrix? Jan31 accepted What values of $a$ and $b$ does this system have infinitely many solutions? Jan31 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. Jan31 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. Jan31 asked What values of $a$ and $b$ does this system have infinitely many solutions? Jan25 accepted Why is the CT system $y(t)=x(2t)$ invertible but its DT counterpart non-invertible? Jan25 comment Why is the CT system $y(t)=x(2t)$ invertible but its DT counterpart non-invertible? Makes sense, thanks. Jan25 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. Jan25 asked Why is the CT system $y(t)=x(2t)$ invertible but its DT counterpart non-invertible? Dec15 awarded Notable Question Sep29 awarded Yearling Jul2 awarded Curious Apr14 revised What is the conditional mass function of $X$ given that $Y = i$? added 171 characters in body