Marks lefschetz character
v195_marks_lefschetz_character.py · registry
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QGEO.MARKS.02 — a Lefschetz/character derivation of the four seam marks (review path 2): instead of positing D4 marks, they are FORCED to be a free µ4 orbit. [E]: ρ:z↦iz (order 4) fixes only {0,∞}; H¹=χ1+χ2+χ3 (A3 exponents (1,2,3), v177) has no trivial character ⇒ no puncture at a fixed point; rank H_1=n−1=3 ⇒ n=4 ⇒ exactly one free orbit ⇒ marks = µ4 (cross-ratio 2); Tr(ρ|H¹)=i+i²+i³=−1, L(ρ)=1+1=2=#fixed. [O] residual relocates from 'seam is P¹∖µ4 (geometric)' to 'H¹ carries the A3-exponent rep' — less circular.
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