DeltaXDeltaP Greater Than or Equal to h/4pi

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C Rob
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deltaXdeltaP is greater than or equal to h/4pi.
 
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It means that the product of the uncertainty in the measurable quantities position and momentum always exceeds that non-zero number.

Therefore, you cannot make fully exact measurements.

From a mathematical point of view, it is a property of the Fourier transform, if I'm not mistaken.