## 5 Badges

8 years, 109 days

## A problem about 'proc, coeff, diff'...

Maple 2020

The file is attached.

Download err.mw

The command 'coeff' doesn't work.

## A problem about coeffs()...

Maple

Hi,

This is not an answer. I can't ask question, since I can't add any 'tags'! This problem appeared long time ago, but I hadn't solved it until now. So I ask here.

I have a question about the function coeffs(). I don't know why it cann't get coefficients for me.

question.mw

Thanks.

## sum, diff and subs...

Maple

I am sorry. There is no 'tag' button on my computer, so I can't ask question here. I don't know the reason.

So I ask here. Now, my real question is:

sum(subs(x = 0, diff(x^2, x \$ k)), k = 1 .. 2);

0

subs(x = 0, diff(x^2, x \$ 2));
2

I think the first result should be 2, but it gives me 0.

Thanks in advance.

## How to deal with the pseudo differential...

Maple 2017

Hi,

I need to compute something involved with the pseudo differential operators.

https://en.wikipedia.org/wiki/Pseudo-differential_operator

Specifically, I need to calculate the inverse of a pseudo differential operator, the multiplication of two pseudo differential operators, and the n-th root of a pseudo differential operator.

I don't know whether Maple could handle these.

Thanks.

## How to find polynomial type solutions us...

Maple

This is my original question, but I can't ask, so I put it here.

I have a system of pde, and it's hard to solve.

But I want to find the type of solutions which are polynomials of degree n of the several independent variables.

Is it possible using 'pdsolve'? Or there are some other commands in Maple to do that?

Thanks!

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