| http://www.w3.org/ns/prov#value | - Then the pair is said to be (1) compatible [28] if for all , whenever is a sequence in such that , for some ;(2) noncompatible [22] if there exists a sequence in such that for some but for at least one is either nonzero or nonexistent;(3) weakly compatible [29] if they commute at their coincidence points; that is, whenever , for some .
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