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Sorry in advance if this is a really stupid questionIn class I've been told that $$sqrt{-25} = 5j $$Converting $sqrt{-25} $ into $5j$ is straightforward...
Asked on 12/20/2021
5 answerProblem: The vertex of a pyramid lies at the origin, and the base is perpendicular to the x-axis at $x = 4$. The cross sections of the pyramid perpendicular...
Asked on 12/20/2021
2 answer$$ lim_{n to infty} frac{1 +cn^2}{(2n+3 + 2 sin n)^2} = ? $$ if I factor the $n^2$ out of denominator, $$ lim_{n to infty}...
Asked on 12/20/2021
1 answerI have to write the linear program which minimizes this function : $$y = max_j sum_{i=1}^{n}c_{ij}x_{ij}$$ My book says that this is not a linear function but it can...
Asked on 12/20/2021
2 answerIn calculus, it is said that $$int f(x); dx=F(x)quadtext{means}quad F'(x)=f(x)tag{1}$$where $F$ is a differentiable function on some open integral $I$. But the mean...
Asked on 12/20/2021 by user9464
5 answerSuppose we are given a rational function$$f(s) = frac{25s}{s^4+18s^3 +134s^2 +472s+680} $$ and we need to find the zeros and poles of the function. Suppose $f(s) =...
Asked on 12/20/2021
1 answerI have a rectangle which I know the width and height of it.I need to draw a line inside the rectangle and the information that I have include knowing...
Asked on 12/20/2021 by user3762238
2 answerI've come across a problem which states: Given a sequence of integrable functions ${f_k}$ ($k≥1$) on $[0,1]$ with the property that $||f_k||_1 ≤ frac{1}{2^k} $,...
Asked on 12/20/2021
1 answerLet $Lambda(x)=(lambda_1x_1,lambda_2x_n,...)$ be an operator $l_2 to l_2$. Show its range is closed iff $inf_{lambda_knot=0} |lambda_k|>0$. I proved the backwards direction. If $x_n$ is Cauchy in...
Asked on 12/20/2021
1 answerIt seems that any $ntimes n$ matrix $A$ can be written like $QLambda O^T$ for orthogonal matrices $Q,O$ and diagonal matrix $Lambda$. I want to...
Asked on 12/20/2021 by Marcus Luebke
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