Mariusz Iwaniuk

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3 years, 343 days

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These are replies submitted by Mariusz Iwaniuk

With no error massages:

sol := pdsolve([pde, ic], w(x, t), HINT = `*`);

#sol := w(x, t) = exp(t)*invfourier(fourier(f(x), x, s)*exp(-(1/2)*(3*I)*t^2*s), s, x)

@ecterrab 

Thanks for information.

@ecterrab 

Thanks for quick fix.

@ecterrab 

With Physics package version 194 I have an error?

error.mw

 

@digerdiga 

I do not know if this is intended action.Maybe KroneckerDelta function in Physics is different than in math.

 

@vv 

This should be something like this?

about(_Z9);

#Originally _Z9, renamed _Z9~:
  is assumed to be: AndProp(integer,RealRange(0,0))

@Christopher2222

Update intsolve to solve linear and non-linear integro-differential , systems and integral equation,systems for symbolic and numeric.

@Christopher2222

Update pdsolve ,numeric to solve partial differential equations for three,four(and more) independent variables.

And solve elliptic PDEsIt's been seven years now and Maple is still standing still.

Very briefly: Maple dosen't know the answer.

More info in Documentation:

?DESol

 

@Rouben Rostamian  

Mathematica better handle multidimensional integrals numerically than Maple :)

Harder  example:

Int(exp(-b^4-c^4-a^3), [a = b^2/(4*c) .. infinity, c = 0 .. infinity, b = -infinity .. infinity]);

#?

My workaround dosen't work very fast now, Maple calculations never ending.

 

MMA solve with about 2.88451 second.

@vv 

Oh, Yes my silly mistake.With correction answers are the same. 

Thanks.

@vv 

About volume, Mathematica gave me a different results:

@Ronan 

I2 := 2;

Optimization:-NLPSolve(I2*(I3-I1)/((I3-I2)*(I2-I1)), {I1+I2 >= I3, 0 <= I1, I1 <= I2, I2 <= I3}, assume = nonnegative);

#[Float(infinity), [I1 = 1., I3 = 2.]]

It's seems Maple FAILS in this case I3 = 2 ?

 

@rlopez 

Thanks for explanation.

Simulation in  MMA and another stuff.

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