Recent content by fwang6

if b-u<0,no critical points exist.

Homework Statement bifurcation for the following 2D system: Homework Equations x'=ux−y+x^3,y′=bx−y The Attempt at a Solution I have got ux−y+x^3=0, y=bx, then x=0 and ±sqrt(b−u). But I don't how to continue to find the bifurcation?

can anyone help me with this question: Find the angle between (a) the line L1 given by the equations y = 2z, x = 0, and (b) the line L2 given by the equations x = 3z, y = 0.

I think the answer should be 39.8