Solving nonlinear first order DE w/ fractional exponents

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Discussion Overview

The discussion revolves around solving a nonlinear first-order differential equation (DE) of the form y' + p y^(1/2) = q, where p and q are constants. Participants explore methods for solving this equation, including Bernoulli's method, and express confusion regarding the applicability of these methods given specific initial conditions.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant expresses confusion about using Bernoulli's method due to an initial condition leading to infinity, questioning its validity when the equation lacks a linear term in y.
  • Another participant suggests considering numerical methods or using computational tools like Wolfram Alpha to analyze the behavior of the DE.
  • A later reply acknowledges the complexity of the solution provided by Wolfram Alpha, indicating it may not be suitable for a college-level differential equations class.
  • One participant shares a solution to the ODE in an attachment, though the content of the solution is not discussed in detail.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the best method to solve the DE, with some advocating for numerical approaches while others express concerns about the complexity of analytical solutions.

Contextual Notes

Participants note limitations related to the initial conditions and the specific form of the DE, which may affect the applicability of certain solution methods.

Who May Find This Useful

This discussion may be useful for students and practitioners interested in nonlinear differential equations, particularly those exploring various solution methods and computational tools.

hotwheelharry
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Hello. I have simple DE

y' + p y^(1/2) = q
---------------
y'=dy/dt
p,q=constant

I am confused because I tried bernoulli's method to solve and I think I exploded the universe.
Basically, my initial condition of t=0,y=0 made infinity, not right. I'm not sure that method works when there is no y^(1) with q anyway.

Any other suggestions to solve?
 
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hotwheelharry said:
Hello. I have simple DE

y' + p y^(1/2) = q
---------------
y'=dy/dt
p,q=constant

I am confused because I tried bernoulli's method to solve and I think I exploded the universe.
Basically, my initial condition of t=0,y=0 made infinity, not right. I'm not sure that method works when there is no y^(1) with q anyway.

Any other suggestions to solve?

Do you need an analytic answer or can you use a computer to show it's behaviour through a numeric scheme? Also did you try wolfram alpha?
 
Haha, totally forgot about wolfram alpha. sooo good. Anyway the solution it gave me is way to complex for my college DEQ class. I should probably change my equation. Thanks anyways.
 
Hello,

Solutionof the ODE in attachment :
 

Attachments

  • ODE LambertW.JPG
    ODE LambertW.JPG
    18.6 KB · Views: 555

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