Nyquist frequency

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Related to Nyquist limit: Shannon limit

Nyquist frequency

(DSP)
The highest frequency that can be represented in a digital signal of a specified sampling frequency. It is equal to one-half of the sampling rate.

See Nyquist Theorem.
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Regular sampling of position allows us to determine momentum below its Nyquist limit, and similarly the regular sampling of momentum will allow us to determine position below its Nyquist limit.
This means information is lost, and signal components above the Nyquist limit will be aliased.