Transcription of Differentiation and the Laplace Transform
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25 Differentiation and the LaplaceTransformIn this chapter, we explore how the Laplace Transform interacts with the basic operators ofcalculus: Differentiation and integration. The greatest interest will be in the first identity thatwe will derive. This relates the Transform of a derivative ofa function to the Transform ofthe original function, and will allow us to convert many initial-value problems to easily solvedalgebraic equations. But there are other useful relations involving the Laplace Transform andeither Differentiation or integration. So we ll look at them, Transforms of DerivativesThe Main IdentityTo see how the Laplace Transform can convert a differential equation to a simple algebraicequation, let us examine how the Transform of a function s derivative,L f (t) s=L d fdt s=Z 0d fdte stdt=Z 0e std fdtdt,is related to the corresponding Transform of the original function,F(s)=L[f(t)]|s=Z 0f(t)e last formula above forL f (t) clearly suggests us
We will confirm that this is valid reasoning when we discuss the “inverse Laplace transform” in the next chapter. In general, it is fairly easy to find the Laplace transform of the solution to an initial-value problem involving a linear differential equation with constant coefficients and a ‘reasonable’ forcing function1. Simply take ...
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