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Question: Equating partial derivative to zero

Question:Equating partial derivative to zero

mskalsi 290 Maple
pdetools
January 18 2016
1

In PDEtools, suppose to I wish assign zero value to certain first order partial derivative such that higher order derivatives automatically vanish in subsequent excutions, how I can do that?

 

> 

with(PDEtools):
> 

alias(u = u(x, y, t))

u

 (1)

Suppose we wish following derivative equal to zero,

> 

diff(u, x) = 0

diff(u, x) = 0

 (2)

If we use ":=" for value assignment we will get error. Under above assuption how can we make following derivatives zero?

> 

diff(u, x, x); 1; diff(u, x, y); 1; diff(u, x, x, x, y)

diff(diff(u, x), x)

  

diff(diff(u, x), y)

  

diff(diff(diff(diff(u, x), x), x), y)

 (3)
> 

``

 

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