Laplace transform

Laplace transform

Laplace transform is a technique for solving differential equations. By using the Laplace transform you can convert a differential equation into another space where the equation is easier to solve. Laplace transform is a linear transformation and it is invertible.

The strength of the Laplace transform technique, is to solve the differential equations where you have a discontinuous right-hand side. So, either the form of the function changes at some time T, or you have an impulse force on the right-hand side.

Table of Laplace Transform

Heaviside step function

Heaviside step function is used to model discontinuous function, i.e. when the form of the function changes. The uses of Heaviside step function include to shift functions and to glue different functions into one.

Heaviside step function

The Dirac Delta Function

The Dirac Delta Function is very useful in modeling an impulse force. It can be modeled as limit of a function, using Heaviside step function. Dirac Delta functions makes doing integrals extremely easy.

Dirac delta function

Series Solution Method

The series solution method is another technique of solving linear differential equations. When all coefficients are constant, you could try an ansatz which is a series solution. Once you substitute ansatz series into the differential equation, next try to write the whole thing as one power series. The theorem there is that if you have a power series equal to 0, then the coefficients of every power of x must be 0.

Series solutions method

Airy’s equations y'' - xy = 0

In case there is non-constant coefficient, the “exponential ansatz” y = ert won’t help. The only thing we have available to us here is either a series solution method or a numerical method of solution.

Series solutions method of Airy's equations

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