Manuscript VII-I@1 · VII-I.tex · section · 907e96ab
Signature matching
The triangle obstruction and what VII-D does supply › Signature matching · lines 1477–1488
The operator monomial at this graph order is the identity: the three quadratic insertions have six legs, and the reflected triangle contracts all six. This identifies the numerical coefficient's place in the old word. It does not construct the other output coefficients or the next binary multiplication.
IX-B explicitly preserves this non-factorization boundary CheungIXB.