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hi 

if I have two partition Pi and Pi 'I want to know the decomposition of Pi' 

How can i specify the ground field C= complex numbers and calculate a primary decomposition for an ideal defined over C? For example

with(PolynomialIdeals):
J:= <x^2 +1 >;
PrimaryDecomposition(J);

should return x+I, x-I, but instead returns x^2+1

Forgive me for not using the "Maple Math" and "Maple Plot" commands.  I tried, but it says everything that I enter is an invalid expression so I'm just entering it as text...

I define two functions, they plot as expected:

f(x) := sin(x);

g(x) := 2*x;

plot( f(x) );

plot( g(x) );

Now I want to plot the composition:

plot( f(g(x)) ); 

Doesn't work!

Let

    G:=s->q(1-ps)^(-1)

be a generating function with 1-p=q in (0,1). Then the repeated function composition

    G(G(G(s)));(G@@3)(s);simplify(%);

gives me some concrete expression. What is the simplest way to get the general expression for 3 replaced by n?