# Reality revision 1.45 — alkane topology transfer test

Matter Harmony Lab 0.2.0 executes the larger molecule study reserved in
revision 1.44.  All C5 and C6 alkane isomers train two fixed ordinary
least-squares representations; all nine C7 isomers are held out from fitting.
Normal boiling and fusion temperatures are scored separately.

Topology helps boiling: adding carbon-skeleton Wiener and first Zagreb indices
to carbon count reduces C7 MAE from 8.554 K to 4.500 K and RMSE from 10.107 K
to 5.382 K.

The same representation fails on fusion: MAE rises from 27.574 K to 135.934 K.
Its n-heptane prediction is 410.46 K versus 182.6 K.  The failure is preserved
without clipping or rescue fitting.

This supports only property-specific predictive value for simple topology.  It
does not identify hidden-dimensional strings or prove that every model failure
is caused by omitted particles.  Conformation, crystal packing, polymorphism,
intermolecular free energy, small-sample extrapolation, and model form remain
live explanations.

Seventeen unit tests and a separately implemented graph/linear-algebra audit
pass.  The next confirmatory block is all 18 octane isomers, reserved until a
crystal-sensitive descriptor set and both property models are frozen.