trolle3000
Reputation
Next privilege 75 Rep.
Set bounties
 Mar23 accepted How to solve $f'(x) = k x \cdot f(x)$ Mar18 comment How to solve $f'(x) = k x \cdot f(x)$ @Amzoti, if you post that comment as an answer I'll accept it Mar18 asked How to solve $f'(x) = k x \cdot f(x)$ Sep24 awarded Autobiographer Jul2 awarded Curious Apr2 awarded Promoter Apr2 awarded Tumbleweed Mar26 asked AUTO Software for ODE's: references or forums? Dec23 comment Derive forward Euler method for two-variable function the function x(t0,x0) is a function of two variables, but it is expanded in only one of them. Dec18 comment Derive forward Euler method for two-variable function Great answer. I knew of the geometrical interpretation, just needed assurance on the Taylor expansion. Dec18 accepted Derive forward Euler method for two-variable function Dec17 comment Derive forward Euler method for two-variable function @yoknapatawpha, edited, thanks! Dec17 revised Derive forward Euler method for two-variable function Typo Dec17 asked Derive forward Euler method for two-variable function Dec15 accepted Prove that there are no fixed points in a non-autonomous system Oct28 comment Prove that there are no fixed points in a non-autonomous system Maybe it's my understanding of fixed points that is somewhat lacking. Is it a necessary condition for a fixed point to occur that $\dot x_1 = 0, \dot x_2 = 0, ... \dot x_{n+1} = 0$? Oct28 asked Prove that there are no fixed points in a non-autonomous system Oct18 comment Forced nonlinear oscillator - analytical methods It was a great help, thanks. I've just verified the validity numerically - the solution trajectories of Duffing's equation converges to one attractor when there is one solution, and one of two attractors depending on initial conditions when there are three solutions (one is unstable). So it works! Oct18 accepted Forced nonlinear oscillator - analytical methods Oct18 comment Forced nonlinear oscillator - analytical methods Now THIS is math: "We will ignore these terms because...(e.g., γ is small, etc. etc.)." Physicist? ;-)