Flux (mathématiques)

Le flux est alors Φ = ∬ Ω F ( σ ( u , v ) ) ⋅ d u d v = ∬ Ω det ( F , ∂ σ ∂ u , ∂ σ ∂ v ) d u d v {\displaystyle \Phi =\iint _{\Omega }\mathbf {F} {\bigl (}\sigma (u,v){\bigr )}\cdot \left[{\frac {\partial \sigma }{\partial u}}\times {\frac {\partial \sigma }{…