„Virki (stærðfræði)“: Munur á milli breytinga
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Lína 14:
* [[Fouriervörpun|Fouriervirki]]: <math> \mathcal{F}\{f(t)\} := \frac{1}{\sqrt{2\pi}}\int_{-\infty}^\infty f(t) e^{- i\omega t}\,dt </math>
* [[Laplacevirki]]: <math>\Delta f :=: \nabla^2 f :=: div (grad) f := \sum_{i=1}^n \frac {\partial^2}{\partial x^2_i} f</math>
* [[Laplacevörpun|Virki Laplacevörpunar]]: <math> \mathcal{L}(f(s)) :=\int_0^\infty e^{-st} f(t)\,dt</math>
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