## 10 Reputation

10 years, 286 days

## Invalid operator parameter name...

Dear Maple users

> f := (c[A], c[B]) -> c[A]+c[B];Error, invalid operator parameter name    f Assign Typesetting:-mambiguous(      (c[A]comma c[B]) rarr c[A] + c[B],       Typesetting:-merror(invalid operator parameter name))>

In Maple, c[A] is actually "c subscript A".

Thanks for help.

PS: Is...

## Error in vector field definition...

Dear Maple Users

What am i doing wrong?

## Differential equation boundary values...

Dear Maple users

This might have been asked before, I'm asking because I believe the solution to my problem is simpler than what i found on google.

I have this problem:



## How to solve differential equation for p...

Dear Maple Users

I wonder how I can use Maple to solve the problem:

for the potential \phi(r). The problem is from the artikle: http://en.wikipedia.org/wiki/Electric-field_screening

I'm particularly puzzled how to implement this differential operator and how to enter the Dirac delta function.

Thanks for any hints.

## Display substitution variables in Integr...

Dear Maple Users

I wonder if it is possible to somehow display what kind of substitution the integration tutor carried out. The tool is ultimately usefull, however it would be very instructive (in addition to the hints it's capable of giving) to see how a variable was "changed".

Is it possible somehow and how?

Thanks, Martin

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