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I was quite surprised that Mathematica does not provide built-in operators to determine whether a set is subset of another one.
I mean, I have tried to find a built-in a solution to this problem but actually didn`t succeed.
Which one is the fastest way to reach this goal in Mathematica?
Well, given two sets
AandB,Ais a subset ofBprecisely when their intersection equalsA. Since Mathematica has theIntersection[]function, you can use that. Similarly, you could see whether or not there are any elements inComplement[A,B], etc.