
Finding the basis of a subspace - Mathematics Stack Exchange
U2 = {(x1, x2, x3, x4) ∈ R 4 | x1 + x2 + x3 − x4 = x1 − 2x2 + x4 = 0} My attempt: for U1; I created a vector in which one variable, different in each vector, is zero and another is 1 and got three vectors: (3,0,-1,1), (0,3,-2,1), (2,1,0,1)
Calculate density and cumulative distribution of: Y = X1 - X2
Hi I have this question in my book (preparing for the exam) and I can't seem to find the answer.. X1 and X2 are independent and identically distributed. They are continuous and uniform over [-1,1]...
How many possible solutions for the equation $x_1 …
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calculus - If $ (X_1,X_2)$ iid and $X_1$ equals $ (X_1+X_2)/\sqrt2
2018年4月24日 · Let random variable X1, with variance one, has the following property: $\frac {X1+X2} {\sqrt2}$ has the same distribution as X1, where X2 is an independent copy of X1. Show that X1 ∼ N(0, 1). So i have to show x1 is normal distribution; its very easy to show the other way of course, when x1 is normal distirbution, then obviously $\frac {X1+X2 ...
probability - Let $X_1$ and $X_2$ are independent $N(0, \sigma^2 ...
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analysis - Why is $x_1 x_2$ quasi-concave on $\mathbb{R}^2 ...
2017年10月15日 · Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
Find The Formula For The Linear Transformation T([x1,x2])
where x= \begin{bmatrix}x1\\x2\\x3\\x4\end{bmatrix} Find a matrix A such that T(x)=A(dot)x. Then verify the equality T(x)=A(dot)x. As an answer, would A = \begin{bmatrix}2&-3&0&0\\5&0&6&0\\7&0&0&-8\end{bmatrix} If my A is correct, when i try to verify the equality T(x)=A(dot)x would i just get \begin{bmatrix}2x1-3x2\\5x1+6x3\\7x1-8x4\end ...
probability - Let X1 and X2 two independent normal distributions ...
2017年9月18日 · Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
What's the difference between using these two formulas to find …
Say we have these two points on a xy plane. (2, 3) and (4, 5). The slope would be 1. To get the equation of the line we can use one of these two formulas. Substitution y and x values in the formul...
How many solutions are there to the equation $x_1 + x_2 + x_3
2017年5月16日 · Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.