██████ ██████

████████ ████████ (████ ███ ███ ██ █████████ ██████) ██ ███ ██ ████████ ████ ███ ████ ███████ ███████████████ ██ ███████ ████████، ███ ███████ ████ ██████ ████ █████████ ██████ █ ████ █████ ███ █████ █████████ █ ██████ ███████████████. ███ █████ ████████ █████ ███ ███ ████ █████ █████ ███ ████████ ███ ██████، ███ ██ █████ ████ ███████.

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

██ █████ ███ ███ ████████ ██████ █████ ███ ███████ ███████، █████ ██ █████ ██ ███ █████ ███████ ███████████████ ██ ██████ ███ ██ ██████. ██ ███ ██████ ████ █████████████ ██ ███ ██، ███ ███████████ ███ ████ ██████ █████ █████ ██████ ████. ████ ███ ███ ██ ████ █████ ██████ █████████:

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

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

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

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

██ ████ █████ ███ ███████ ██ ███ ████ ██████، ███ ██ █████ ████ █████ ███████ ███ ████ ████ █████ █████████ ███ ████ █████ ████.

${\displaystyle \overrightarrow{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}={\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}\sum _{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}^{(\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>})}{\overrightarrow{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}}^{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}={\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}\left[{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}^{(\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>})}\overrightarrow{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}+{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}^{(\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>})}{\overrightarrow{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}}^{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}+{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}^{(\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>})}{\overrightarrow{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}}^{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}+\dots \right]}$

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

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

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