## 1039 Reputation

4 years, 304 days

## Error !...

With Physics package version 194 I have an error?

error.mw

## Confusing......

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

## ?...

This should be something like this?

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

## Update intsolve...

@Christopher2222

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

## Update pdsolve, 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.

?DESol

## MMA vs Maple = 1:0...

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.

## Mistake......

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

Thanks.

## Volume.....

About volume, Mathematica gave me a different results:

## FAIL...

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 ?

## OK....

Thanks for explanation.

## Simulation in  MMA...

Simulation in  MMA and another stuff.

## Design.....

It means that pdsolve is design to not solving PDE with weak solution?

## Simple.....

Answer is simple, Maple is not a magic box that'll spit out a solution to any problem.

https://www.12000.org/my_notes/pde_in_CAS/pde_in_cas.htm

## Zero......

Probably  tripel integral is equal to Zero. My crystall ball that says.

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