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Aug
19
answered Find the general solution and draw the phase portrait
Jun
27
answered Lotka-Volterra equations modified
Jun
27
answered Interpreting phase-plane portraits
Jun
26
answered Solving $2^x - 3^x + 6^x =0$.
Jun
21
asked Periodic orbits of “even” perturbations of the differential system $x'=-y$, $y'=x$
Jun
21
answered Trapping region for $\ddot x + (x^2-2) \dot x + x + \sin(x) =0$
Jun
20
answered Analyzing the singularity of ODE system
Jun
13
answered Convexity of the ratio of the standard normal PDF by its CDF
Jun
12
answered Show that the first quadrant of a dynamical system is invariant.
Jun
12
answered Vandermonde's Identity : Summations with binomial coefficients
Jun
3
answered Using the symmetry assumption in this familiar probability problem
Jun
1
answered Finding a Lyapunov function for a given system
May
25
answered How to plot a phase portrait for system of differential equations in mathematica or R?
May
21
answered Stationary distribution of an increasing stochastic process with a cut-off
Apr
16
answered How do we plot nonlinear differential equations
Mar
7
asked Joint distribution of the signs of the partial sums of independent standard normal random variables
Feb
6
answered what is the phase portrait of this system.
Feb
5
answered Limit points of the differential system $\dot {x}=y-x+x^3$, $\dot{y}=-x$
Jan
11
answered Is the following sequence bounded below by zero?
Jan
11
answered Finding big O of a function