Explain nysquist criterion and interval?

the Nyquist criterion is often stated as fs > 2B.  And 2B is called the Nyquist rate for function with bandwidth B.
Nyquist interval: The maximum time interval between equally spaced samples of a signal that will enable the signal waveform to be completely determined.
Note 1: The Nyquist interval is equal to the reciprocal of twice the highest frequency component of the sampled signal.

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