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Dušek's $k=0$ conjecture for null homogeneous geodesics on g.o. spaces
About 12 years old
Dušek's $k=0$ conjecture. For all null homogeneous geodesics in $G/H$ , one has $k=0$ in the geodesic lemma.
opengeodesic-orbit-spaces homogeneous-geodesics pseudo-riemannian-geometry
05