Mach's principle holds that inertial effects are determined by the global distribution of matter, making 'inertial structure' an abstraction from relational facts, not an independent causal agent.

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Causal agent(The teacher is described as the causal agent undermining their own credibility): Something that actively causes or makes something happen—in this case, the teacher is doing something that creates the problem.
Mach's Principle(Used by Einstein as a constraint on valid solutions to the gravitational field equations): The principle that inertia is determined solely by matter, such that no inertial structure or field can exist in the absence of matter
Relational facts(as used in metaphysics): True statements about how two or more things are connected to or compared with each other, rather than facts about a single thing alone.
abstraction(Godfrey, Quodlibet V, q. 10): The process by which the agent intellect draws out potentially intelligible content from phantasms, making that content available to the possible intellect

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