« Utilisateur:Ellande/Brouillon2 » : différence entre les versions

= \lim_{\delta t \to 0}\left[ \frac{\int_{DV'} \kappa(\vec r ,t+\delta t)~\mathrm d V

- \int_{DV} \kappa(\vec r,t)~\mathrm d V }{\delta t}\right]

\int\!\!\!\!\!\int\!\!\!\!\!\int_{D_3\delta V_3} \kappa(\vec r ,t+\delta t)~\mathrm d V

+ \int\!\!\!\!\!\int\!\!\!\!\!\int_{D_2V_2} \kappa(\vec r ,t+\delta t)~\mathrm d V

- \int\!\!\!\!\!\int\!\!\!\!\!\int_{D_2V_2} \kappa(\vec r,t)~\mathrm d V

- \int\!\!\!\!\!\int\!\!\!\!\!\int_{D_1\delta V_1} \kappa(\vec r,t)~\mathrm d V \right]