mehran rajabi

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These are questions asked by mehran rajabi

hi every body: 

i want to solve the below ODE with boundry conditions ics, can anybody help me?

The ODE:

ode := x^3*(diff(f(x), x, x, x, x))+alpha*(x^4*(diff(f(x), x, x))+x^3*(diff(f(x), x, x))-x^2*(diff(f(x), x)))-2*x^2*(diff(f(x), x, x, x))+3*x*(diff(f(x), x, x))-3*(diff(f(x), x))+R*x*f(x)^2-R*x^2*(diff(f(x), x, x))*(diff(f(x), x))-3*R*x*f(x)*(diff(f(x), x, x))+3*R*f(x)*(diff(f(x), x))+x^2*R*f(x)*(diff(f(x), x, x, x))-M^2*(x^3*(diff(f(x), x, x, x))-x^2*(diff(f(x), x))) = 0

The boundry conditions:
ics := f(0) = 0, f(1) = 1, (D(f))(1) = 0, limit(diff((diff(f(x), x))/x, x), x = 0) = 0

M,R,alpha are constants.

with regards... 

Hi every body : 

I want to slove this below PDE with conditions 1&2, can every body help me, tnx.

PDE := diff(u(x, t), t)+6*u(x, t)*(diff(u(x, t), x))+diff(u(x, t), x, x, x) = 0;

1.x=0

2.assume t is step function(Heaviside).

with regards....

Hi;
what's the difference between "assuming" and "assume" commands in maple? tell me this problem with example. Thanks.
with regards...

Hi everybody:

I'm going to learn programming with maple 18, are there any good and new pdf files for learn it?

with regards...

 

Hi everyone:

I have two functions in terms of theta variable, how can I expressed function Y(X)?

X :=(theta)->cos(theta)+0.8e-1*cos(3.*theta)

Y :=(theta)->-sin(theta)+0.8e-1*sin(3.*theta)

I will earn Y(X) infact.

Thanks alot...

Mehran.

 

 

 

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