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Hi, I'm undergraduate student.

Until now the renormalization group ideias is the most beautiful thing that I already seen:

$$ \exp\left(-S_{\Lambda'}[\phi]\right)\ \stackrel{\mathrm{def}}{=}\ \int_{\Lambda' \leq p \leq \Lambda} \mathcal{D}\phi \exp\left[-S_\Lambda[\phi]\right]. $$


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