Dear database experts,
we have a discussion here about the definition
of 4th normal form.
a) A Relation r of type R is in 4 NF, if it is in 3NF
and all multivalued dependencies in fact are
for example Rob/Coronel, Database Systems ... (?)
b) the same defintion, except 3NF is substituted by BCNF
for example Date, An Introduction ...
Any dicussion, literature, ... is welcome.