I am reading Gauss's paper GENERAL INVESTIGATIONS OF CURVED SURFACES, but encountered a problem in Theorem VI (p. 4).
How does the following observation come from? In Gauss's notation, $LL'$ denotes the angle between the two vectors.
2026-04-11 16:52:05.1775926325
Theorem VI in GENERAL INVESTIGATIONS OF CURVED SURFACES by Gauss
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