What is Boyce Codd Normal form?

What is Boyce Codd Normal form?
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Answer :

A relation schema R is in BCNF with respect to a set F of functional dependencies if for all  functional dependencies in F+ of the form a-> , where a and b is a subset of R, at least one  of the following holds:
* a- > b is a trivial functional dependency (b is a subset of a)
* a is a superkey for schema R
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