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Switzerland-Ri-Ri Azienda Directories
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Azienda News:
- arithmetic - Whats wrong with this fake proof that $2+2=5 . . .
$$2+2=5$$ arithmetic; fake-proofs; Share Cite Follow edited Sep 28, 2017 at 20:04 Jam 10 6k
- Find closed form for $1, 2, 2, 3, 4, 4, 5, 6, 6, 7, 8, 8, 9, 10, 10 . . .
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- what is 1 - 1 2 + 1 3 - 1 4 + 1 5 - 1 6 + 1 7 - 1 8 +1 9
I know that it is converging because it is alternating series with terms getting smaller to zero but I do not know what it converges to value
- How to calculate the intersection of two planes?
From the coefficients of x, y and z of the general form equations, the first plane has normal vector $\begin{pmatrix}1\\2\\1\end{pmatrix}$ and the second has normal vector $\begin{pmatrix}2\\3\\-2\end{pmatrix}$, so the line of intersection must be orthogonal to both of these
- Why John Tukey set 1. 5 IQR to detect outliers instead of 1 or 2?
$\begingroup$ CORRECTION (This post should REPLACE my post from 2020-03-10): Prof Murray H Siegel, in Lecture 20 of The Joy of Mathematics (Part II) said, "I was present when Dr John Tukey gave a talk, and he was asked why one point five was chosen [for the IQR multiplier] what he [Tukey] said was [that] two was too big and one was too small and one point five was just right "
- Formula for $1^2+2^2+3^2+. . . +n^2$ - Mathematics Stack Exchange
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- derivatives - Prove using Rolles Theorem that an equation has exactly . . .
Prove that the equation $x^7+x^5+x^3+1=0$ has exactly one real solution You should use Rolle’s Theorem at some point in the proof
- Composition relation of R1 ∘ R2 - Mathematics Stack Exchange
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- Finding null space of matrix. - Mathematics Stack Exchange
As mentioned in the comments, provided your arithmetic is accurate, this is the correct response The idea behind the null space of a matrix is that it is precisely those vectors in the domain being sent to the $\mathbf{0}$ vector in the codomain
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