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████████████ ██ ███████ ██████ ██ ████ ████████████ ███ █████ ██████ ██ ██ ████ ██ ███ ██ ██████ ███ ██████ ██ ██ ███████ ████████████ ██ █████████ █████ ████ ██ ███████ ██ ██████████, ██████ ████ ███████ ████ ███ ████ ███████ ██ █████████ █ █ █+██ █ ███ █████ ███████████ ████████████ ████████████ ██████████████ ███████ ███ █████ ██ █████████:

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

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

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

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

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

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

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

██ ███

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

█ ██████:

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

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

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

${\displaystyle \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}={\int }_{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}\overline{\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>}\overline{\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>}}}\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>}}+{\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>}}\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>}}{\int }_{{\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>}{\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>}}+{\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>}}^{\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 \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>}\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>}}\frac{\mathrm{\partial }\mathrm{<span\; word-length="2"\; 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{<span\; word-length="1"\; class="word\; redacted">█</span>}}_{\mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}}\left(-⟨\overline{\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>}\overline{{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}^{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}}}\cdot \mathrm{\nabla }⟨\overline{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}⟩\right)\cdot \mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}{\overline{\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>}}$

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

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

█████ █████

██ ██ █████ ██ █████████████ ███████ █ ████████████, ████ ███ ████ ██████ █ ███████████ ██ █████████ ██ ███ ███████ (██ ███████) ██████████, █ ██ ████ █████ ███████ ██ ███████ ██ ██████████ █████ █████████ █████████ ██ ███████ ██ ████████████ ███'██████ ██████████ █████ █████ █████ ███████ ██ ████████ ████████ ██ ██████████ █ ███ ████ ██████ ██ ███████ ██ ███████ ██████████ █████ █████████ ████████ ███ █████████ ██ ███████:

${\displaystyle \frac{\overline{\overline{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}}:\mathrm{\nabla }⟨\overline{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}⟩}{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}=\frac{\mathrm{\nabla }\cdot (\overline{\overline{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}}\cdot ⟨\overline{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}⟩)}{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}-\frac{\mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}{\mathrm{\partial }\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}}$

█████████ ███████████

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

${\displaystyle \{\cdot ,\cdot \}⟶\frac{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}{\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}\mathrm{<span\; word-length="1"\; class="word\; redacted">█</span>}}[\cdot ,\cdot ]}$

██ █████████████ ████'███████ ███████ ██ ███████████ ██ ██ ████ ████████ ██ █████ ██████.

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

█████ ██████████ ████████ ███ █ █████████ ████████ █'███████ ██ ███████ █████-██████████ ███ ███ ██ █████████████ ████'███████ ███████ ██ ████████ ███████ █████████ ██ █████████ ██ ███████ ███ █████ ████████.