# Thread: Help with nonlinear differntial equations !!!

1. ## Help with nonlinear differntial equations !!!

Hi , i am new at this forum, i have a doubt about non linear differential equations systems; iīve been searching on some books about the solution of these systems, i wanted to know if there is some method which i can determinate the kind of system (damped, overdamped ...) and the response time, i couldnīt fine one, i hope anybody can help me, or can recomend a good book, please!

2. ## help with non linear differential equations !

Hi , i am new at this forum, i have a doubt about non linear differential equations systems; iīve been searching on some books about the solution of these systems, i wanted to know if there is some method which i can determinate the kind of system (damped, overdamped ...) and the response time, i couldnīt fine one, i hope anybody can help me, or can recomend a good book, please! the system is this:
dp1/dt = exp-(c + p1 + q1)
dp2/dt = exp-(c + p2 + q1)
dq1/dt = exp-(c + p1 + q1)
dq2/dt = exp-(c + p2 + q2)

3. Originally Posted by orion8406
Hi , i am new at this forum, i have a doubt about non linear differential equations systems; iīve been searching on some books about the solution of these systems, i wanted to know if there is some method which i can determinate the kind of system (damped, overdamped ...) and the response time, i couldnīt fine one, i hope anybody can help me, or can recomend a good book, please! the system is this:
dp1/dt = exp-(c + p1 + q1)
dp2/dt = exp-(c + p2 + q1)
dq1/dt = exp-(c + p1 + q1)
dq2/dt = exp-(c + p2 + q2)
Something doesn't look right here. Is the third equation

$\displaystyle \frac{dq_1}{dt} = e^{-(c+p_1+q_2)}$?

4. Yeah, i am sorry, i had a mistake, the equations are:

dp1/dt = -exp(c+q1+p1)
dp2/dt = -exp(c+q2+p2)
dq1/dt = -exp(c+q1+p2)
dq2/dt = -exp(c+q2+p1)