Calculate the first four Picard Iterates of the equation y' - y = x^2

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SUMMARY

The discussion focuses on calculating the first four Picard Iterates for the differential equation y' - y = x^2 with the initial condition y(0) = -1. The first iterate, φ₁, is derived as φ₁ = -1 + ∫₀ˣ (s² - 1) ds. The function f is defined as f(x, y) = x² + y, which is essential for subsequent iterations. The participants seek clarification on how to compute φ₂ and further iterates, indicating a need for a step-by-step breakdown of the integration process.

PREREQUISITES
  • Understanding of differential equations, specifically first-order linear equations.
  • Familiarity with the concept of Picard Iteration in solving differential equations.
  • Proficiency in integral calculus, particularly definite integrals.
  • Basic knowledge of initial value problems and their solutions.
NEXT STEPS
  • Calculate φ₂ using the formula φ₂(x) = φ₀ + ∫₀ˣ f(s, φ₁(s)) ds.
  • Explore the convergence properties of Picard Iteration for nonlinear differential equations.
  • Review examples of Picard Iteration applied to different initial value problems.
  • Investigate numerical methods for approximating solutions to differential equations when analytical solutions are complex.
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Students and professionals in mathematics, particularly those studying differential equations, as well as educators looking for examples of Picard Iteration in practice.

brit123
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Help Please!

Calculate the first four Picard Iterates of the equation y' - y = x^2 with the condition y(0) = -1

and it was given that y'(x) = x^2 +y and y(0)= -1



Need a little help with this question... Not sure what to do.
 
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The definition of Picard iterates is

[tex]\phi_0=y(x_0),[/tex]

[tex]\phi_{n+1}(x)=\phi_0+\int_{x_0}^x f(s,\phi_n(s))ds,[/tex]

where [itex]f[/itex] is given by

[tex]y'(x)=f(x,y(x)).[/itex]<br /> <br /> In your case, [itex]f(x,y(x))=x^2+y[/itex], [itex]\phi_0=y(0)=-1[/itex], and<br /> <br /> [tex]\phi_1=-1+\int_0^x (s^2+\phi_0)ds=-1+\int_0^x (s^2-1)ds.[/tex]<br /> <br /> What is [itex]\phi_2[/itex]? and [itex]\phi_n[/itex]?[/tex]
 
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