The right derivation operator \\(g: 2^Y \rightarrow 2^X\\) is defined similarly.

First let \\(g_1: Y \rightarrow 2^X\\) be the function sending an attribute \\(a \in Y\\) to the set of objects which have that attribute, i.e.,

\\[g_1(a) = \lbrace o \in X\ |\ (o,a) \in K \rbrace \\]

Then define the right derivation operator \\(g: 2^Y \rightarrow 2^X\\) by

\\[g(y) = \bigcap_{a \in y} g_1(a)\\]

which is equivalent to

> let \\(g(y)\\) be the objects which have every attribute in \\(y\\).