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Wiktionary:Babel
de Dieser Benutzer spricht Deutsch als Muttersprache. en-2 This user is able to contribute with an intermediate level of English. ru-1 Этот участник владеет русским языком на начальном уровне.
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Mainly I'm working on the german Wikipedia. Due to my global account there is space for a page here - so I fill it with these lines...

$j^{\mu }=\sum _{i=1}^{N}{\frac {\delta {\mathcal {L}}}{\delta (\partial _{\mu }\phi _{i})}}\varphi _{i}\quad ,\quad \varphi _{i}:=\left.{\frac {\partial \phi _{i}}{\partial \alpha }}\right|_{\alpha =0}$

(BTW: This Noether current fulfills the Continuity equation :-)

For further details look at my page in german.