8 Some Additional Examples Laplace Transform
Additional ExamplesIn addition to the Fourier Transform and eigenfunction expansions, it is sometimesconvenient to have the use of the Laplace Transform for solving certain problems in partialdifferential equations. We will quickly develop a few properties of the Laplace Transform anduse them in solving some example TransformDefinition of the TransformStarting with a given function of t,f t ,we can define a new functionf s of the variable new function will have several properties which will turn out to be convenient forpurposes of solving linear constant coefficient ODE s and PDE s. The definition off s is asfollows:DefinitionLetf t be defined fort 0and let the Laplace Transform off t be defined by,L f t 0 e stf t dt f s For example:f t 1, t 0,L 1 0 e stdt e st s|t 0t 1s f s for s 0f t ebt, t 0,L ebt 0 e b s tdt e b s t s b |t 0t 1s b f s ,for s Laplace Transform is defi
The Laplace transform is defined for all functions of exponential type. That is, any function f t which is (a) piecewise continuous has at most finitely many finite jump discontinuities on any interval of finite length (b) has exponential growth: for some positive constants M and k
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