The propagation problem is the problem of explaining by the structural properties of the swinging system what the character of the swings would be in case the system was started in some initial situation. (Ragnar Frisch)

The propagation problem is the problem of explaining by the structural properties of the swinging system what the character of the swings would be in case the system was started in some initial situation.

Ragnar Frisch

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case character initial problem propagation situation structural

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