The prescribed transverse event

The source's full lengths, areas, affine chart words, primitive winding, and peripheral matching remain documentary geometric data CheungVIIF. They are not needed to infer the finite-channel support theorem. In the product, the event locus is the line $\{\tau =0,x=o\}\subset \mathcal{W}$; it is not an isolated point event of the $3+1$-dimensional background.