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relation between integral and summation
What is the relation between a summation and an integral ? This question is actually based on a previous question of mine here where I got two answers (on...
Apr 12, 2026
Archive: News
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About G-Sets (or group actions).
I've been studying group theory for two months, and we're now on "Actions on a group G". The definition we were given was this: Definition (Grou...
Apr 12, 2026
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Chi square goodness-of-fit test for Uniform distribution using Matlab
I need to test random numbers generators in 1, 2 and 3 dimensions. Criteria of test is that generated numbers are from uniform distribution. I am doing th...
Apr 12, 2026
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do 3D perpendicular lines have negative reciprocal slopes?
it's stated in this answer that the directional vector is a nice analog for the slope in $3D$ space $⟨x,y,z⟩=⟨x_0,y_0,z_0⟩+t⟨m_x,m_y,m_z⟩$ now suppos...
Apr 12, 2026
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Triangle wave equation
I have a triangle wave equation represented as $$ y = \dfrac{A \cdot \left(P - \lvert\;\left(x \mod (2 \cdot P) \right) - P \;\rvert\right)}{P} $$ where $...
Apr 12, 2026
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Meaning of n-connected pairs
A topological space $X$ is $n$-connected if the homotopy groups $\pi_r(X)$ for $0 \leq r \leq n$ are trivial groups. This means (let's say geometrica...
Apr 12, 2026
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Find the point on a plane $3x + 4y + z = 1$ that is closest to $(1,0,1)$
Is anyone able to help me with regards to this question? Find the point on a plane $3x + 4y + z = 1$ that is closest to $(1,0,1)$ http://i.imgur.com/ywdsJ...
Apr 12, 2026
![How to express the 'general solution' of a matrix with a unique solution [closed]](https://news.conceivablytech.com/uploads/how-to-express-the-039-general-solution-039-of-a-matrix-with-a-unique-solution-closed_720.jpg)
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How to express the 'general solution' of a matrix with a unique solution [closed]
Hi guys so I've been given some uni homework for the subject Calculus and Linear Algebra. Basically it's just your standard 'give the gener...
Apr 12, 2026
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Why is $\sqrt{|x-2|}$ continuous but not differentiable at x=2?
Why is $\sqrt{|x-2|}$ continuous but not differentiable at x=2? I thought that if there exists a limit on both sides then it would be differentiable?
Apr 12, 2026
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Harvard math 55 materials
I would like to know what Harvard math 55 go through.So can anyone please point me to their course and their problem sets ?Your help is appreciated.
Apr 12, 2026
