EugeneKalentev

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These are questions asked by EugeneKalentev

Hello everyone.

Please help me solve this equation for u using Maple.

Div(u) = d(ru)/(dr)*1/r = 2*a = const; u = u(r);

``

Divergence(u) = d(ru)/(r*dr) and d(ru)/(r*dr) = 2*a and 2*a = const

u = u(r)


Thanks in advance for your help.

Hello. Is there a built-in function to determine the required sample size for different distributions in a population?

Hello.
I can not find a tool for calculating the number of permutations with fixed points. I looked at the package combinat. Help me please.

 

restart

int(sin(x), x)

-cos(x)

(1)

int(x^2, x)

x^2*_X

(2)

``

 

Download 12.mw

Hello everyone.

Tell me how to solve this equation grad(div(f(x,y,z)))+K*Laplacian(f(x,y,z))=0

Here, the function f defines a vector field.

I tried so

restart

with(Physics[Vectors]):

Physics:-Vectors:-Setup(mathematicalnotation = true)

[mathematicalnotation = true]

(1)

eq := Gradient(Divergence(f(x, y, z)))+K*Laplacian(f(x, y, z)) = 0

Error, (in Physics:-Vectors:-Nabla) Physics:-Vectors:-Divergence expected a vector function, but received the scalar function: f(x, y, z)

 

``


Download eq.mw

 

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