Math Forum / Math Software / Maple / July 2004

Hi all. I am writing a function to take the material derivative
Du/Dt=du/dt+(u.nabla)u in cylindrical coordinates. Everything works fine
in cartesian coordinates, but when I do the same in cylindrical
coordinates, I get an error message. Here it is:

#    eqn is linear in variable X over Q(w3),
#    where w3 satisfies a quadratic equation in a RootOf.
#    We expect it to have a unique solution.
#    Instead, Maple 9 on SUN SPARC SOLARIS or IBM INTEL LINUX.

Why doesn't (x^a)^(1/a) reduce to just x?
I've tried with(RealDomain) and simplify.

under maple 8, why this 2 computation doesn't give the same result sqrt(2)/2
1) give 0 and 2) give sqrt(2)/2 as expected.....
1) evalf(Sum(piecewise(x>=0 and x<8,sqrt(2)/2,0),x=0..-15));
2) evalf(Sum(piecewise(x<=0 and x>-8,sqrt(2)/2,0),x=0..15));

let us see the following examples
     I.
restart:
C1 := (a*sqrt(b/a)-b*sqrt(a/b)):

 Dear Maple friends,
how can I put non-numeric tick marks along the axes of a plot
in maple?
Thanks for any help

Is there any way I can use Maples asymptotic expansion function with the
cdf  cumulative density function
function.  When I try something like
with(stats):

I try to find a closed form solution in maple for the following (cubic)
equation:
                          c d
f(x):     a - b/x - 1/2 --------------------- = 0

In the news "Constant polynomial has multiple values"
I observed the fact that euler(0,1); -> -1, with Maple(V,5).
Robert then said: "It's still in Maple 9."
Now I found the solution to ugly bugs like these:

restart;
assume(a=0,b<>0);
que1:=is(b/a,algebraic);
que2:=traperror(is(b/a,positive));

Is it possible in Maple to calculate derivatives wrt. derivatives?
I would like to compute Eulers differential equation.
So for instance is it possible to get somthing like
f:=diff(x(t),t)^2;

Maple 9.5 adds some new features (some for modules) i have long been
waiting for.
One of them is the possibility to overload procedures and operators.
So have a look at this module:

 I need the following delta function in Maple (I am using Maple 9):
1- delta(x)=0 for x<>0;
2- int(delta, -infinity..infinity)=1;
2- congugate@delta=delta

A quote from a Maple session :
solve((lambda-1)*(lambda^5+lambda^4-1-lambda),lambda);
1, I, -I, -1, -1
Chris

Can anybody explain me what is "forall". What does it do? I am so
stupid that help and examples suggested by Maple did not help me :(.
Thank you.