Services & Resources / Wolfram Forums
MathGroup Archive
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 1998

[Date Index] [Thread Index] [Author Index]

Search the Archive

Nonlinear Differential Equation

  • To: mathgroup at
  • Subject: [mg14142] Nonlinear Differential Equation
  • From: David Djajaputra <dd4b at>
  • Date: Mon, 28 Sep 1998 03:51:54 -0400
  • Organization: University of Virginia
  • Sender: owner-wri-mathgroup at


I'm just wondering if anyone knows how to solve this DE:

y''(x) = - 2 y(x) / [1 - y^2(x)],   y(0) = 0,  y'(0) = 1.

The function is periodic. Mathematica says that it's transcendental but
it cannot solve it. I'm curious if the amplitude and/or the period can
be obtained in closed forms. By the way, if you plot it the amplitude

about 0.6 and the period is about 3.7.

Much thanks in advance,


  • Prev by Date: Postscript utility
  • Next by Date: Re: Integral?
  • Previous by thread: modifying built-in objects in init.m
  • Next by thread: Re: Nonlinear Differential Equation