I'm reading this paper from uhlenbeck & schoen,a regularity theory for harmonic maps, and have some troubles with their notation.
Can you help me out and tell me what they mean by $\pi$ in the proof of lemma 2.1?
2026-03-28 01:47:27.1774662447
regularity theory for harmonic maps, inquiry
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From the context, I gather that it is capital $\Pi$. The small $\pi$ appearing in the text is most likely a typo (also because 4 lines later the same expression appears with $\Pi$ instead of $\pi$).