The first rule in the definition of inc_sal says that if there are no
employees in a current database state /, then the same database state should be
returned as the updated database state, that is, (/,/) Ε M
d
( inc_sal
(
Inc
)
).
The second rule says that a database state L is accessible from a current
database state / through inc_sal(Inc) (that is, (7,L) Ε Af
i/
(inc_sal
(Inc) )), if / and L satisfy the conjunction of the following statements: The
state J ...
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