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@@ -93,7 +93,20 @@ $$\delta(x - a) \quad \text{est centrée en } x = a$$
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$$\int_{-\infty}^\infty \delta(x - a) f(x) \, dx = f(a)$$
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4. **Lien avec la transformée de Fourier** :
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$$\mathcal{F}(\delta(x)) = 1$$
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# 5.
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# 5. Distribution de 2 variables
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## Gradient d'une fonction à 2 variables
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$$\nabla f(x, y) = \begin{bmatrix} \frac{\partial f}{\partial x} \\ \frac{\partial f}{\partial y} \end{bmatrix}$$
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## Dérivée partielle selon x
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$$
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\frac{\partial f}{\partial x} = \lim_{\Delta x \to 0} \frac{f(x+\Delta x, y) - f(x, y)}{\Delta x}
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$$
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## Dérivée partielle selon y
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$$\frac{\partial f}{\partial y} = \lim_{\Delta y \to 0} \frac{f(x, y+\Delta y) - f(x, y)}{\Delta y}$$
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## Rotationnel en 2D
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$$\nabla \times f = \frac{\partial f_y}{\partial x} - \frac{\partial f_x}{\partial y}$$
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## Théorème de Schwarz
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$$\frac{\partial^2 f}{\partial x \partial y} = \frac{\partial^2 f}{\partial y \partial x}, \quad \text{si } f_{xy} \text{ et } f_{yx} \text{ sont continues.}$$
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---
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© Félix MARQUET
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