The table 'EC Extension table' [1] does not make clear the semantics of
intersectionOf()
(with an empty list of descriptions) I suspect the answer is O; in which
case it may be clearer to interpret
intersectionOf(c1 ... cn)
as
O \cap EC(c1) \cap ... \cap EC(cn)
Not a typo, this one, just a clarification.
[1]
http://www.w3.org/TR/owl-semantics/direct.html#3.2--
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