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Mach's principle

Mach's principle is a hypothesis first stated by Ernst Mach in 1893, which states that:

"The inertia of any system is the result of the interaction of that system and the rest of the universe. In other words, every particle in the universe ultimately has an effect on every other particle."

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Thomas a Kempis

... convent; it lays stress on the passive qualities and does not touch with firmness the string of active service in the world. That which makes it acceptable to all ...