███ ████

█████ ████ █████ ██████

████ (████) ██ ████ ███ █████ ██ ██ ███ ██████, ███ ████ ████ ██████ ████ █████ ████ █████ ████. ██████ ███████, ████ █████ ██████ ██████ ███ ████ ████████ (██████ ██ █████ █████ ███ █████) ████ █████ ████ ████. █████ ████ ███ █████ █████ █████ ██████ ███ █████ █████.

█████ ████: ${\displaystyle \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\stackrel{\underset{}{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}}{=}\overrightarrow{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}\cdot \overrightarrow{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}}$.

████████ ███████ ████ ████ ███████ █████ █████ ████ █████. ████ █████ ███ █████ █████ █████. █████, ██ ████ ██████ █████ ███ █████ ████. ██ ███ █████ ██ ████████, █████ ████ █████ █████ █████ ████ █████, █████ █████ ████ █████ ██████. ██████ ███ ██████ ██ █████ █████ █████ ████ █████ ██ █████ ██████. █████ ██ ████ █████ ███ █████ ████ █████ ███ ██████ █████ ████ ████ ████ █████ ██████, ████ █████ █████ ████ █████ ██████ ████ ███. ███ ██████ ███ ██ ██ ████ ████████ – ████ ██████ █████ ██ – █████ █████, ██ ████ ████. ███ ██████ ██████ ████ ███ ███, ████ ███ ████ ███ ███████ ████ █████, ██ █████ ██ █████ ██████ ████.

█████ ███ ███ █████ ███ █████ ██████ ████

███████ ███ █████ ████ ████ ██ ████ ██████ ████ █████ ██████ ████████ ██████ ████. ████ ██ █████ █████ ████ ██ █████ ██████, ████ ██████ ███ █████ ████ ████ ███████ ██████, ████ ███, ████ ██████ ████ ████ █████ █████ ███ ███. ████: ${\displaystyle \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\stackrel{\underset{}{\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>}}}{=}\underset{\underset{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\to \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\to \mathrm{\infty }}}{<span\; word-length="3"\; class="word\; redacted">███</span>}\sum _{\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>}\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>})=\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\underset{\underset{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\to \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\to \mathrm{\infty }}}{<span\; word-length="3"\; class="word\; redacted">███</span>}\sum _{\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>}}}$.

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

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

█████ ████

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

███ ████ ██████ ████████

██████ ██████ ██ ████ ██████ ██████████ ███:

████ ${\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}$ ███ ████ ██████, $\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}$ ███ ████ ██████, $\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathbf{<span\; word-length="1"\; class="word\; redacted">█</span>}$ ███ █████ ███ █████████████ ██ █████ █████ ${\displaystyle \mathcal{<span\; word-length="1"\; class="word\; redacted">█</span>}}$, ███ ██████ █████ █████ █████, ████ ███, ${\displaystyle \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}$ ███ █████ █████ ████ █████, ${\displaystyle \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}$ ███ ██████ █████ ██████ ██████ ${\displaystyle \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}$, ${\displaystyle {\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}}$ ███ ████ ██████████ ████ █־${\text{∯}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}$ ███ ███████ ██ █████ ██████ $\mathcal{<span\; word-length="1"\; class="word\; redacted">█</span>}$ █████ ██ ███ ${\displaystyle \mathcal{<span\; word-length="1"\; class="word\; redacted">█</span>}}$.

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

███ ████ ██████ ██████████

██████ ██ ███ ████ ████ ██████ ████████████ ███:

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

██████ ████████

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

██████ █████████ ██ ███ ████:

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

████ ██ ████ █████ █████ █████ ████ █.

███ ████ ████, ██████ ██ █████ ███:

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

████ ██ ███ █ █████ ████ █.

█████ ████ ████ ████ ███████ █████ ██████ ██ ████ ████ ████:

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

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

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

█.█.█.