Laplace transform

Laplace transform, defined as

ℒf(s) = ∫₀^+ ∞f(t)e^− stdt

is comparable to Fourier transform

ℱf(s) = ∫_− ∞^+ ∞f(t)e^− 2πistdt

Ahem, bilabial Laplace transform, as alluded by the author, is to replace 0 with −ꝏ. But this is not important.

要有拉变，f一个：O(eᵗ)。