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DescriptionCompleteness in Hilbert space.png
English: Illustration of completeness in a Hilbert space. A particle moving along a piecewise linear path, travelling a finite total distance, must have a well-defined displacement.
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|Description = Illustration of [[complete metric space|completeness]] in a [[Hilbert space]]. A particle moving along a piecewise polygonal path, travelling a finite total distance, must have a well-defined displacement.
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