█████ ██ ███████

█████ ███████

██ █████ ██ ███████ ███████ ███ ██ █████ ██████████████ ${\displaystyle {\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}}$ ███████ ██ ██ █████ █████████ ${\displaystyle \mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}}$ ██ ███ █████ ██████ ${\displaystyle \mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}$ █ ████ ███'███████ █████ ██████████ ████'█████ ██ █████ ███ ██████ █████████ ${\displaystyle {\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}(\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>})}$ ███ █████ ██████████ ██ ██████████ ${\displaystyle \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}(\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>})}$ ███ ██ ██████ █████ ████ █████████:

${\displaystyle {\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}=-\frac{\mathrm{\partial }{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}(\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>})}{\mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}}$

████ ██ ██████ █████████ █ ████ ████'█████████ ██ ██████████:

${\displaystyle {\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}=\underset{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}(\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>})}{\int }\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}(\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>},\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>})\cdot \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}}$

███ ${\displaystyle \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}}$ ████████ ████'████ ${\displaystyle \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}$ ██████████ ██ █████ █████ █████████ ██ ██████. ██ █████ ██████████████ █ ████████ ████████ ██ ██████ ██████ ███ █████ █████████ ███ █████ ██ ██████ ${\displaystyle \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}$ ███ ████████:

${\displaystyle {\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}=\frac{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}{\oint }_{\mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}\cdot \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathit{<span\; word-length="1"\; class="word\; redacted">█</span>}={\oint }_{\mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}(\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}+\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}\times \mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>})\cdot \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathit{<span\; word-length="1"\; class="word\; redacted">█</span>}}$

████ ${\displaystyle \mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}$ █ ██ █████ ██ ${\displaystyle \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}$ █:

${\displaystyle \mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}=\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}(\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}+\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}\times \mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>})}$

█ ██ █████ ██ ███████. ██ ████ ██ ████████ ███████████, ██ ███████ ████████ ███ █████ █████████ █████████ █ █████ ████████ ████████, █ █'█████████ ██████ ██ █████:

${\displaystyle {\oint }_{\mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}\cdot \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathit{<span\; word-length="1"\; class="word\; redacted">█</span>}=-\frac{\mathrm{\partial }{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}(\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>})}{\mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}}$

██ █████ ████ ███ ██ ████████ ███ ██ ████████ ████████ ██ ██████ ████ ██████████ ███ ██████ █████████, ███████████████ ███ ██ █████████ ██ █████████████ ████'███████: ██ █████ ███████, ██ ██ ██████ ███████████ █ ██ ███████████, ██ █████ █████████ ████████ █████ ████████ ███████ ████████ ██ █████ ██████████ ███████████ ████ ███████████, ██████ ██ ██ ██████ ███ █████████, ██ █████ █████████ ████████ ███████████ █'██████████, ███████████ ███'███████. ██████ ████████ █ ████ █████ ████ █████ ██ ████.

██ ████████ █ █████████████ ████████ ██ ████████ █ ████████ ███ ███████████, ███ █ █████ ██ ██████████ ██ ██████ █ ██████████ ██████ ████ ██████████ █████████ ███ █████ █████████ ██████. ███ ████ ██ ███ ██ █████████ ████████ ███ ████████ █ █████ █ █████████ ██ █████████ ███████ ██ █████████████ ███████ █████ █████ ██ ███████, ██████ ████ ███████ ███ ████████ ██ ████ ███'███████ ██ ██ █████ █████████. ██ ███ ██████████ ███████ ███ ██ █████ █████████ █ ██ ███████ ████ ███████████.

█████ ██████

██ █████ ██████ (█ █████████████) █████ █████ ██ ███████ █ ██████ ████ █████ ███████ ███ ███████ ███ ██████:

${\displaystyle {\oint }_{\mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}\cdot \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}={\int }_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}\mathrm{\nabla }\times \mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}\cdot \text{<span word-length="1" class="word redacted">█</span>}\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}}$

███ ██ ███████████ ██ ██████ █████████, █ ██████ ██ ███████ ██ ████████████ █ ████████ ████████ ███ █████, ██ ██:

${\displaystyle -\frac{\mathrm{\partial }{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}(\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>})}{\mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}=-\frac{\mathrm{\partial }}{\mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}{\int }_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}\cdot \text{<span word-length="1" class="word redacted">█</span>}\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}={\int }_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}-\frac{\mathrm{\partial }\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}}{\mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}\cdot \text{<span word-length="1" class="word redacted">█</span>}\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}}$

███████████ ███ ██████████ █████ ██ █████ ██████ █████ █████ ██ ███████, ███ ███████████ ██ █████ █████████ ██ ███████:

${\displaystyle \mathrm{\nabla }\times \mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}=-\frac{\mathrm{\partial }\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}}{\mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}}$

█████████████

████████████ ████ █████ ████████ ███ ██████████████ ██ ███████████ ████████ ████'█████████████████, █████ ██ █████ ██ ███████ ███ ██████ ████████ █ ███████ █████ █████████ ██ ███████ █ █████ █████ ██ ███████.

██ █████████ ██ ████████ █████████ ███ ██████ ██████████ ███ █████ ██ ████ ${\displaystyle \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}(\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>})}$ (███ ███ ██████ ██ ████):

${\displaystyle \frac{\mathrm{\partial }{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}}{\mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}=\frac{\mathrm{\partial }}{\mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}{\int }_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}(\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>})}\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}(\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>})\cdot \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}{\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}}^{\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}}}$

██ █████████ ████'█████████ ███████ ███ ███ ██████ ████'██████████, ███ █████ ███████ ██ ███ █████ █████████, ███ ███:

${\displaystyle {\frac{\mathrm{\partial }{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}}{\mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}|}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}={\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}}={\int }_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}({\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}})}{\frac{\mathrm{\partial }\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}}{\mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}|}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}={\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}}\cdot \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}{\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}}^{\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}}+\frac{\mathrm{\partial }}{\mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}{\int }_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}(\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>})}\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}({\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}})\cdot \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}{\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}}^{\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}}}$

████ ${\displaystyle {\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}}$ █ ██ █████ ███████. ██ █████ ███████ ███ ██████ ██ ██████ ███ ██████ ███████ ███████████ █'█████████ ██ ███████–███████:

${\displaystyle {\int }_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}({\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}})}{\frac{\mathrm{\partial }\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}}{\mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}|}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}={\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}}\cdot \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}{\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}}^{\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}}=-{\oint }_{\mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}({\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}})}\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}({\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}})\cdot \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}$

██████ ███ ██ ███████ ███████:

${\displaystyle \frac{\mathrm{\partial }}{\mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}{\int }_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}(\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>})}\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}({\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}})\cdot \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}{\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}}^{\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}}}$

██ ████ ███████ ████████ █████████. ██ ██ █████ ██ █████ █ ██ ███████ █████ ███ ██████████ ███ ██████ ███ █████ █████████ ██████████ ██ ████: ████ ██ ███████ ██████ ${\displaystyle \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}$ █████ █████ ██ ████ ███ ████████ ${\displaystyle \mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}}$ ███ ██ █████ ${\displaystyle \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}$, ████ "██████" ███ ██████████ ██ ████ ${\displaystyle \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}{\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}}^{\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}}=\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\times \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}$. ████████ ██ ██████████ ██████████ ██ ██████ █:

${\displaystyle \mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}\cdot (\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\times \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>})=-\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\cdot (\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}\times \mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>})}$

██████ ██ ██:

${\displaystyle \frac{\mathrm{\partial }}{\mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}{\int }_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}(\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>})}\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}({\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}})\cdot \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}{\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}}^{\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}}=-{\oint }_{\mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}({\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}})}(\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}({\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}})\times \mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}({\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}))\cdot \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}$

████ ${\displaystyle \mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}}$ █ ██ ████████ ██ ██ █████ █████ █████ ${\displaystyle \mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}$.

██████ █ █████████:

${\displaystyle {\frac{\mathrm{\partial }{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}}{\mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}|}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}={\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}}=-{\oint }_{\mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}({\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}})}\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}({\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}})\cdot \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}-{\oint }_{\mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}({\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}})}(\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}({\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}})\times \mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}({\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}))\cdot \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}$

██ █████ ██████████████ ${\displaystyle {\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}}$ █ ████████ ████ █'███████ ███ █████ ██ ██████ ██████████ ███ ████████ ██ ████ ████████ █████ █████. ███████████ ██ █████ ██ ███████ ████ █ ████ █:

${\displaystyle {\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}=\oint (\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}+\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}\times \mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>})\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}$

██ ███:

${\displaystyle \frac{\mathrm{\partial }{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}}{\mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}=-{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}}$