Barbour and Bertotti's Machian relational mechanics shows that a consistent Machian dynamics requires no preferred asymptotic structure, making any fixed boundary condition non-Machian by construction.

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Barbour and Bertotti(developers of the modern version of this theory): Julian Barbour and Bruno Bertotti are theoretical physicists who built on earlier ideas to show how motion and forces could work without needing to assume space itself exists as a fixed container.
Boundary condition(the low-entropy past boundary condition): A fixed starting or ending state that constrains what can happen in a physical system; here, it means the universe's initial conditions at the beginning of time.
Dynamics(Modern physics, attributed foundationally to Descartes): The branch of physics that studies the motion of bodies under the action of forces.
Ernst Mach(as the originator of the theory discussed): An Austrian physicist and philosopher (1838–1916) who argued that motion and forces only make sense when described relative to other objects, not relative to empty space itself.

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