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REGIONAL UPDATES — Apr 09

Meaning of the spectral norm of a matrix

Is there an intuitive meaning for the spectral norm of a matrix? Why would an algorithm calculate th...

ENERGY NEWS — Apr 09

Probability of Posting a Quad and Trip on 4chan

Important Pre-Requisite Knowledge On the image board 4chan, every time you post your post gets a 9 ...

$Inverse laplace transform of $\frac{1}{s^3(s-1)}$$

FASHION NEWS — Apr 09

Inverse laplace transform of $\frac{1}{s^3(s-1)}$

I have a problem with this transform. I know that using this theorem (see the theroem) I can get the...

CELEBRITIES ON SOCIAL MEDIA — Apr 09

Find a normal vector onto the line

How can I find normal vector on the given line. For example if I have a line $3x - 5y = 1$, what wou...

BUSINESS NEWS — Apr 09

How can one "cancel out" set union as if I am using the additive property of equality of real numbers?

I am aware that for equalities involving, for instance involving real numbers, we have the cancellat...

CELEBRITY MEMOIRS — Apr 09

Find the number of bicycles and tricycles [duplicate]

Help for my son. My math is a bit rusty and I'm trying to remember how to go about answering t...

CLIMATE REPORTS — Apr 09

Center of mass and moment of inertia of a $2$-dimensional donut?

I have a an assignment and I'm stuck on this question: First of all I can't figure out th...

CLIMATE REPORTS — Apr 09

Function transformation: shrink horizontally

Write the formula for $f(x)$, if the graph of $f$ can be obtained from the graph of $y = g(x)$ by sh...

TIKTOK TRENDS — Apr 09

Derivation of the energy equation in fluid dynamics

I'm working through Acheson's 'Elementary Fluid Dynamics' and i'm having tr...

CHILD STARS — Apr 09

sum of all the numbers that can be formed using the digits 2,3,3,4,4,4..

How to find the sum of all the numbers that can be formed using the digits 2,3,3,4,4,4.. What should...

CHILD STARS — Apr 09

How do you find the radius with only the slant height? Please show work.

The radius of the circle is 12cm, it is then made into a cone Question: A cone is made by joining ...

WEATHER NEWS — Apr 09

How to derive the Riemann Curvature Tensor?

I'm taking a course in General Relativity, and before getting into Physics itself, the required...

CELEBRITY BODYGUARDS — Apr 09

Rate of Change of Volume in a Sphere

Assume that the radius $r$ of a sphere is expanding at a rate of $7$ in. /min. The volume of a spher...

CELEBRITY BIRTHDAYS — Apr 09

Calculate distance in 3D space

Imagine I want to determine the distance between points 0,0,0 and 1,2,3. How is this calculated?...

$Calculate remainder of $12^{34^{56^{78}}}$ when divided by $90$$

WEATHER NEWS — Apr 09

Calculate remainder of $12^{34^{56^{78}}}$ when divided by $90$

Calculate remainder of $12^{34^{56^{78}}}$ when divided by $90$ First of all,I'm not sure abou...

REGIONAL UPDATES — Apr 09

Difference in logic notations for maths and computer science

I am reading: How to prove it, A structured approach by Daniel J.Velleman and despite it being a boo...

CELEBRITY BODYGUARDS — Apr 09

SageMath: defining class of functions on Elliptic Curves

In SageMath, I would like to manipulate rational functions on elliptic curves (defined on finite fie...

FINANCIAL NEWS — Apr 09

Calculation of Radon–Nikodym derivative

Suppose the function $X \colon \mathbb{R} \longrightarrow \mathbb{R} \colon x \longmapsto X(x) : = x...

CULTURE — Apr 09

What is the meaning of the symbol "$\left|\underline{\;n\;}\right.$" for integer $n$?

For example, (6) The sequence of primes is endless. For, if $p$ is any prime, the number ${\...

CLIMATE REPORTS — Apr 09

Goldschmidt division example with estimates?

I have found in Gonzalez/Diaz-Herrera/Tucker: Computing Handbook an example for the Goldschmidt divi...

FINANCIAL NEWS — Apr 09

What is an anti chain

Which of the following is the correct definition of an anti chain .. 1). A subset S of a partially ...

CELEBRITY BODYGUARDS — Apr 09

derivative with respect to constant.

I have been beating my head against this question for quite some time, I do not know whether it has ...

ENERGY NEWS — Apr 09

Can covariance be negative?

So I always thought that covariance could take any real number. However, in class today my professor...

REGIONAL UPDATES — Apr 09

How many ways $12$ persons may be divided into three groups of $4$ persons each?

How many ways $12$ persons may be divided into three groups of $4$ persons each? I think the answer...

CELEBRITY FLASHBACKS — Apr 09

Sigma notation formula $i=0$ [closed]

I am trying to help a high school student to solve summation calculation problems. The $i$ value of ...

REGIONAL UPDATES — Apr 09

Eigenvectors in Matlab/Octave, function "eig()", why are the eigenvectors output like that? [closed]

You can calculate eigenvectors of a matrix with eig() function like this: [eigenvectors, eigenvalue...

CHILD STARS — Apr 09

Drawing Plausible Phase Portrait

The equation: $$\dot{x} = f(x),\space x\in \mathbb{R},\space \text{where} \space f\begin{pmatrix}x_...

$How do you get $\alpha$ from $\tan{\alpha}$?$

CLIMATE REPORTS — Apr 09

How do you get $\alpha$ from $\tan{\alpha}$?

How do you get $\alpha$ from $\tan{\alpha}$? Hello, I want to know how to obtain $\alpha$ from $\tan...

CELEBRITIES ON SOCIAL MEDIA — Apr 09

multiplication in H-space and loopspace of the H-space

Let $X$ be an $H-space$, and let a multiplication $,\cdot,$ be given, associative up to homotopy. L...

$Prove this formula $1+\cos\theta+\cos2\theta+...+\cos n\theta=\frac{1}{2}+\frac{\sin(n+\frac{1}{2})\theta}{2\sin\frac{\theta}{2}}$ [duplicate]$

BUSINESS NEWS — Apr 09

Prove this formula $1+\cos\theta+\cos2\theta+...+\cos n\theta=\frac{1}{2}+\frac{\sin(n+\frac{1}{2})\theta}{2\sin\frac{\theta}{2}}$ [duplicate]

This is homework but I’m really stuck. The question is to prove a fromula which states: $$1+\cos\t...

Find sample size given standard deviation, sample mean, confidence interval

CELEBRITY FASHION LINES — Apr 09

Meaning of the spectral norm of a matrix

Probability of Posting a Quad and Trip on 4chan

Inverse laplace transform of $\frac{1}{s^3(s-1)}$

Find a normal vector onto the line

How can one "cancel out" set union as if I am using the additive property of equality of real numbers?

Find the number of bicycles and tricycles [duplicate]

Center of mass and moment of inertia of a $2$-dimensional donut?

Function transformation: shrink horizontally

Derivation of the energy equation in fluid dynamics

sum of all the numbers that can be formed using the digits 2,3,3,4,4,4..

How do you find the radius with only the slant height? Please show work.

How to derive the Riemann Curvature Tensor?

Rate of Change of Volume in a Sphere

Calculate distance in 3D space

Calculate remainder of $12^{34^{56^{78}}}$ when divided by $90$

Difference in logic notations for maths and computer science

SageMath: defining class of functions on Elliptic Curves

Calculation of Radon–Nikodym derivative

What is the meaning of the symbol "$\left|\underline{\;n\;}\right.$" for integer $n$?

Goldschmidt division example with estimates?

What is an anti chain

derivative with respect to constant.

Can covariance be negative?

How many ways $12$ persons may be divided into three groups of $4$ persons each?

Sigma notation formula $i=0$ [closed]

Eigenvectors in Matlab/Octave, function "eig()", why are the eigenvectors output like that? [closed]

Drawing Plausible Phase Portrait

How do you get $\alpha$ from $\tan{\alpha}$?

multiplication in H-space and loopspace of the H-space

Prove this formula $1+\cos\theta+\cos2\theta+...+\cos n\theta=\frac{1}{2}+\frac{\sin(n+\frac{1}{2})\theta}{2\sin\frac{\theta}{2}}$ [duplicate]

Find sample size given standard deviation, sample mean, confidence interval

Motivation behind study of martingales

Are there more even numbers than odd numbers?

How to represent a logic equivalence?

What's 110 degrees counterclockwise from positive direction of x-axis?