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- Ordinary Differential Equations/Non Homogenous 1
- Ordinary differential equation
- 17.2: Nonhomogeneous Linear Equations

In mathematics , an ordinary differential equation ODE is a differential equation containing one or more functions of one independent variable and the derivatives of those functions. A linear differential equation is a differential equation that is defined by a linear polynomial in the unknown function and its derivatives, that is an equation of the form. Among ordinary differential equations, linear differential equations play a prominent role for several reasons. Most elementary and special functions that are encountered in physics and applied mathematics are solutions of linear differential equations see Holonomic function. When physical phenomena are modeled with non-linear equations, they are generally approximated by linear differential equations for an easier solution. The few non-linear ODEs that can be solved explicitly are generally solved by transforming the equation into an equivalent linear ODE see, for example Riccati equation. Some ODEs can be solved explicitly in terms of known functions and integrals.

In this section we will take a look at the first method that can be used to find a particular solution to a nonhomogeneous differential equation. One of the main advantages of this method is that it reduces the problem down to an algebra problem. The algebra can get messy on occasion, but for most of the problems it will not be terribly difficult. There are two disadvantages to this method. Second, it is generally only useful for constant coefficient differential equations. The method is quite simple. Plug the guess into the differential equation and see if we can determine values of the coefficients.

Homogeneous Linear Equations with constant Coefficients. Equation 1 can be expressed as. As in the case of ordinary linear equations with constant coefficients the complete solution of 1 consists of two parts, namely, the complementary function and the particular integral. The particular integral is the particular solution of equation 2. Finding the complementary function.

The general form of the particular integral is substituted back into the differential equation and the resulting solution is called the particular integral. 3. General.

Higher Order Differential Equations. Every non-homogeneous equation has a complementary function CF , which can be found by replacing the f x with 0, and solving for the homogeneous solution. For example, the CF of. The superposition principle makes solving a non-homogeneous equation fairly simple. The final solution is the sum of the solutions to the complementary function, and the solution due to f x , called the particular integral PI.

In this document we consider a method for solving second order ordinary differential equations of the form. Method Given an ordinary differential equation in :. The solution is found through augmenting the results of two solution methods called the complementary function and the particular integral. Complementary Function The first step is to find the complementary function, that is the general solution of the relevant homogeneous equation a The homogeneous equation is derived by simply replacing the by zero:. The upshot of this is that and and the substitution of these terms into the homogeneous equation and cancelling out the common term gives the auxiliary equation: c The auxiliary equation is a quadratic equation which needs to be solved4 so that we can progress towards the complementary function.

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## Floreal V.

When y = f(x) + cg(x) is the solution of an ODE, f is called the particular integral (P.I.) and g is called the complementary function (C.F.). We can use particular integrals and complementary functions to help solve ODEs if we notice that: 1. The complementary function (g) is the solution of the homogenous ODE.