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On the other hand, 4NF sample has a resistivity of [10.sup.6] [ohm] x cm, but the introduction of Ag nanoparticles leads to a remarkable reduction of electrical resistivity up to [10.sup.4] [ohm] x cm after the percolation threshold.
According to Mannino (2004), "The normalization story does not end with 4NF. Other normal forms have been proposed, but their practicality has not been demonstrated" (p 245).
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Update anomalies and the justification for 4NF in relational databases.
Fagin [4] is responsible for "fourth normal form" (4NF).
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Other normal forms such as fourth normal form (4NF) and fifth normal form (5NF) were proposed later, based on the concepts of multivalued dependencies and join dependencies, respectively.
The significance and properties of reduced MVDs are also discussed in the context of database design (e.g., 4NF decomposition) and conflict-free MVDs.
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