Nonlinear Dynamics and Chaos
Nonlinear Dynamics and Chaos
2nd Edition
ISBN: 9780813349107
Author: Steven H. Strogatz
Publisher: PERSEUS D
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Chapter 9.2, Problem 6E
Interpretation Introduction

Interpretation:

To show that the system ˙x = -vx + zy, ˙y = -vy + (z - a)x, ˙z = 1 - xy is dissipative. To show that the fixed points may be written in parametric form as x* = ±k, y* = ± k- 1, z* = vk2, where v(k2- k- 2) = a. To classify the fixed points.

Concept Introduction:

  • ➢ The divergence of a vector field is

    . f = x˙x + y˙y + z˙z

  • ➢ The fixed points are calculated as ˙x = 0, ˙y = 0, ˙z = 0

  • ➢ The Jacobian matrix is given by

    A = (˙xx˙xy˙xz˙yx˙yy˙yz˙zx˙zy˙zz)

  • ➢ The Eigen value λ can be calculated using the characteristic equation

    |(A - λI)| = 0

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Question 1. Prove that the function f(x) = 2; f: (2,3] → R, is not uniformly continuous on (2,3].
Consider the cones K = = {(x1, x2, x3) | € R³ : X3 ≥√√√2x² + 3x² M = = {(21,22,23) (x1, x2, x3) Є R³: x3 > + 2 3 Prove that M = K*. Hint: Adapt the proof from the lecture notes for finding the dual of the Lorentz cone. Alternatively, prove the formula (AL)* = (AT)-¹L*, for any cone LC R³ and any 3 × 3 nonsingular matrix A with real entries, where AL = {Ax = R³ : x € L}, and apply it to the 3-dimensional Lorentz cone with an appropriately chosen matrix A.
I am unable to solve part b.
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