Hi

how can solve this system of equations:

-dp/dz=(0.855*(1+2*x))/p

dx/dz=((6.39*10^-3*p*(1-x))/(1+2*x))

that x=f(z) and p=f(z)

and at z=0     p=5 bar  & x=0

Hi

I can not my software,I get this error"the specified procedure could not be found"

what should I do?

Hi

y''+(4/x)*y'-a*y^n=0

that a=constant

Hi

 Mt := 1-(sum(4*l^2*exp(-beta[n]^2*tau)/(beta[n]^2*(l^2+beta[n]^2)), n = 1 .. infinity))

where the beta[n]s   are  roots of :

beta[n]*BesselJ(1, beta[n])-l*BesselJ(0, beta[n]) = 0

for  l=1,10,20,40,50,100

I want to plot Mt vs. tou for these l 's  in one diagram

Hi

equation:

X=1/(a)*[2/(mc0^(m-2)]^(1/2)*(c/c0)^(1-m)*[(c/c0)^m-1]^(1/2)*F(1,1-1/m;3/2;1-(c/c0)^(-m))

for:

c0=0,0.277164,0.340257,0.408617,0.581345,0.649268 and a^2=2

and   m=0,1/2,1/3,3/4,2,3

if 0<x<1 and 0<C(x)<1

and F is hypergeometric function

plot C(x) vs. x