Hello, this is probably painfully simple but I cannot figure it out... so there it goes

there are four set of equations, but only one solution can be assigned to the parameter p (which is the outcome of R1, R2, R3, or R4).

1: if `and`(x4 = 0, x1 > 0) then assign(solpR1) end if;

2: if x2 = 0 then assign(solpR2) end if;

3: if `and`(x1 = 0, x4 = 0) then assign(solpR3) end if;

4: if `and`(x3 = 0, x1 = 0) then assign(solpR4) end if;

The time derivative problem I had earlier is solved, thanks very much, except for the equation below:

diff(x3, t) = 2*lambda*a(1-p)*[x1*(x1-1)+x2*(x2-1)]-2*a*p*x3*[x2+2*(x3-1)]-2*delta*x3

which I seek to solve using:

dsolve(diff(x3(t), t) = 2*lambda*a(1-p)*[x1*(x1-1)+x2*(x2-1)]-2*a*x3(t)*p*[x2+2*(x3(t)-1)]-2*delta*x3(t));

Somehow the following error keeps coming back:

<p>Hello,<br />
<br />
I cannot figure out how to solve the following time derivative (I use the dot notation for x1 but don't think thats relevant):<br />
<br />
diff(x1, t) = -2*a*x1*(x1-1)+(1-b)*x0<br />
<br />
because when I use dsolve for this equation:<br />
<br />
dsolve(diff(x1, t) = -2*a*x1*(x1-1)+(1-b)*x0)<br />
<br />
there comes a error, stating 'Error, (in dsolve) expecting an ODE or a set or list of ODEs. Received 0 = -0.4e-2*x1*(x1-1)+.10*x3+.10*x5'<br />

I'd like to know how to insert the following differential equation in maple 12 (or older doesn't matter that much) without incuring a - Error, recursive assignment -

Plaese note that, in the orignial text, a dott is added over the variable x1:

 x1(dot) := -2*a*x1*(x1-1)+(1-b)*x0

and that this differential equation describes change in the number of entities (x) that move through state 1, there a couple of more equations but i can't figure out how to insert the above one in maple correctly.