Stevens passed away in 1999 at 48 working on the second edition. Rago finished it and wrote the third. APUE is still the only book on Unix system programming with portability tables for almost every syscall across Linux, BSD, macOS, and Solaris.
When the universe is modeled as an expanding 3-sphere, curvature transports outward from baryonic mass the way ripples spread from a stone. At large radii the transport reorganizes — the geometry takes over — and a flat velocity profile follows from the shape of space itself, not from hidden mass.
Three plots below.
Left: two gas-dominated dwarfs.
Center: weak gravitational lensing across the KiDS-1000 survey, split by galaxy morphology. Right: two galaxy clusters at megaparsec scales.
Orange is the prediction. Green is MOND. Red is LCDM.
The acceleration gap isn’t a missing-mass problem. It’s a geometry problem — and the geometry already exists.
Full paper + code: zenodo.org/records/199634…
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