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Willem de Sitter - Both the law of inertia and the law...
Both the law of inertia and the law of gravitation contain a numerical factor or a constant belonging to matter, which is called mass. (Willem de Sitter)

Both the law of inertia and the law of gravitation contain a numerical factor or a constant belonging to matter, which is called mass.

Willem de Sitter

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belonging constant factor gravitation inertia law mass matter numerical

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