I'm trying to look up sources on the nyquist sampling rate, but I keep finding this small subtle difference between sources, and I am not sure if it is laziness or some subtle point I am missing. Sometimes I see the nyquist rate as Fs>2Fm and sometimes I see it as Fs>=2Fm. So is it the sampling rate is any frequency equal or greater than two times the max frequency, or does the sampling frequency have to be greater than two times the signal's max frequency? Or is there some subtlety that I am missing in the articles I am reading, and under some circumstances it is equal to or greater and others it has to be greater. I feel like I am finding online sources that write it one way and some write it the other way, and I just want to make sure my understanding is exact. Thanks in advance.