Solution of first order integro-differential equation Consider \frac{dy}{dx} + p(x)y = \int_{

Angeline Hayden

Angeline Hayden

Answered question

2022-04-23

Solution of first order integro-differential equation
Consider dydx+p(x)y=0y(x)dx=R(say)
y(0)=0f(x)y(x)dx.
I want to solve above differential equation. Here is my try:
y(x)=y(0)e0xp(τ)dτ+R0xesxp(τ)dτds.
where R=0y(0)e0xp(τ)dτdx+R00xesxp(τ)dτdsdx
y(0)=0f(x)y(0)e0xp(τ)dτdx+R0f(x)0xesxp(τ)dτdsdx.
Now, I am not able to find R which is independent of y(0) and y(0) which is independent of R. Please let me know if it is possible to find solution of this integro-differential equation.

Answer & Explanation

Tatairfzk

Tatairfzk

Beginner2022-04-24Added 12 answers

Step 1
Given: R=y(0)0e-0xp(τ)dτdx+R00xe-sxp(τ)dτdsdx
y(0)=y(0)0f(x)e-0xp(τ)dτdx+R0f(x)0xe-sxp(τ)dτdsdx
y(0)=y(0)0f(x)e-0xp(τ)dτdx+R0f(x)0xe-sxp(τ)dτdsdx
you can rearrange to obtain two linear equations with two unknowns. The former equation is equivalent to
0=y(0)0e-0xp(τ)dτdx+R00xe-sxp(τ)dτdsdx-1
Step 2
while the latter is equivalent to
0=y(0)0f(x)e-0xp(τ)dτdx-1+R0f(x)0xe-sxp(τ)dτdsdx
This can be solved with just elementary algebra, or using matrix algebra. You will get y(0) and R exclusively in terms of f and p, provided suitable integrability conditions for these functions. It depends on the determinant of the corresponding matrix. If the matrix is invertible, then y(0) and R are unique.

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