It turns out that for s in the interior of that interval (away from the endpoints), the function t → f(t)e-st will be integrable on the whole real line (you do not need to prove this). Therefore, the bilateral Laplace transform, (£f)(s) = f(t)e-* dt, is well defined for such s. Taking for granted that you can exchange derivatives in s and integrals in t (a version of Leibniz' rule for differentiation under the integral sign), give an expression for and then for, d" (Lf)(s) dsn 2 d" (Lf)(s) dsn mn := = (−1)n 1s=0 where n is an arbitrary natural number. Note that this question is about derivatives of the Laplace transform, not the Laplace transform of derivatives discussed in class in the unilateral case. "
It turns out that for s in the interior of that interval (away from the endpoints), the function t → f(t)e-st will be integrable on the whole real line (you do not need to prove this). Therefore, the bilateral Laplace transform, (£f)(s) = f(t)e-* dt, is well defined for such s. Taking for granted that you can exchange derivatives in s and integrals in t (a version of Leibniz' rule for differentiation under the integral sign), give an expression for and then for, d" (Lf)(s) dsn 2 d" (Lf)(s) dsn mn := = (−1)n 1s=0 where n is an arbitrary natural number. Note that this question is about derivatives of the Laplace transform, not the Laplace transform of derivatives discussed in class in the unilateral case. "
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Transcribed Image Text:2. It turns out that for s in the interior of that interval (away from the endpoints), the function t →
f(t)est will be integrable on the whole real line (you do not need to prove this). Therefore, the
bilateral Laplace transform,
∞
(Lf)(s) = T [ f(t)e-st dl,
and then for,
∞
is well defined for such s. Taking for granted that you can exchange derivatives in s and integrals in t
(a version of Leibniz' rule for differentiation under the integral sign), give an expression for
d" (Lf)(s)
dsn
d" (Lf)(s)
dsn
mn :=(−1)n
s=0
where n is an arbitrary natural number. Note that this question is about derivatives of the Laplace
transform, not the Laplace transform of derivatives discussed in class in the unilateral case.
9
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