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We show that a 1-parameter family Ricci flow ancient solutions arises fromthe natural collapsings of the twistor space of positive quaternion K\"ahlermanifolds. We use these ancient solutions to show that a positive quaternionK\"ahler manifold is isometric to one of the Wolf spaces.

Ricci flow unstable cell centered at an Einstein metric on the twistor space of positive quaternion K\"ahler manifolds of dimension $\geq 8$