![What does $E[XY]$ mean?](https://news.conceivablytech.com/uploads/what-does-e-xy-mean_720.jpg)
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What does $E[XY]$ mean?
Let's say I have two random variables, $X$ and $Y$. $X$ is the value of a fair die, $Y$ is the result of a coin flip, with heads being 1 and tails be...
Apr 19, 2026
Archive: News
![how to calculate the partial area of a circle given its radius? [closed]](https://news.conceivablytech.com/uploads/how-to-calculate-the-partial-area-of-a-circle-given-its-radius-closed_720.jpg)
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how to calculate the partial area of a circle given its radius? [closed]
how to calculate the partial area of a circle given its radius? Given: radius $r$ and two axis coordinates. Find areas $A$, $B$, $C$ and $D$
Apr 19, 2026
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Proving triangle sum theorem and parallel lines and corresponding angles
To prove triangle sum theorem, you either have to accept that corresponding angles created by a transversal through two parallel lines are equal or you ha...
Apr 19, 2026
![Is it mathematically valid to separate variables in a differential equation? [duplicate]](https://news.conceivablytech.com/uploads/is-it-mathematically-valid-to-separate-variables-in-a-differential-equation-duplicate_720.jpg)
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Is it mathematically valid to separate variables in a differential equation? [duplicate]
I read the following statement in a book on Calculus, as part of my mathematics course: Technically this separation of $\frac{dy}{dx}$ is not mathematical...
Apr 19, 2026
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Variation of Hoeffding's Inequality for (weakly) dependent random variables
Is there a version, or modification, of this theorem for weakly dependent random variables? Or perhaps at least one for the special case involving Bernoul...
Apr 19, 2026
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A non-abelian $p$-group $G$
There is some facts about finite non abelian $p$-groups over the site. For example, when $n=3$: Nonabelian groups of order $p^3$. I have found the followi...
Apr 19, 2026
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strictly diagonally dominant matrices in numerical
I am trying to find all values for $\alpha$ and $\beta$ for which $ A(\alpha, \beta)= \left[ \begin{matrix} 3&0&-2\\\alpha&3&2\\-2&2&a...
Apr 19, 2026
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What is the term for a group of graphs?
I know the term for a group of trees is a "forest", but what is the term for a group of graphs? The difference between a graph and a tree is that a tree c...
Apr 19, 2026
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Laplacian and spherical symmetry
Please can you explain me why $$ \nabla^2 G_{\omega}(R) = f(R) $$ is equivalent to $$ \frac{1}{R} \frac{d^2(RG_\omega(R))}{d R^2} = f(R) $$ Here: $G_\omeg...
Apr 19, 2026
![Why isn't the sequence $\frac 1n$ bounded? [closed]](https://news.conceivablytech.com/uploads/why-isn-039-t-the-sequence-frac-1n-bounded-closed_720.jpg)
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Why isn't the sequence $\frac 1n$ bounded? [closed]
Since "Every convergent sequence is bounded" and bounded means bounded above and below. Then why is the sequence $\frac 1n$ convergent? since it is not bo...
Apr 19, 2026
