A value that is less than or equal to every element of a set of data.

Example: in {3,5,11,20,22} 3 is a lower bound.

But be careful! 2 is *also* a lower bound (it is less than any element of that set), in fact any value 3 or less is a lower bound.

Example: how tall is a human? We may not know the exact shortest human, but we can say that **0** is a lower bound (can't be less than zero in height, right?)

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