| http://www.w3.org/ns/prov#value | - least upper bound of A, then r < a <=L where r is a number less than L. since r < a <=L where r is a number less than L, and p is positive, then rp < pa <= pL. since rp < pa <= pL, and rp is a number less than pL, then pL is the least upper b
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