8.6 This exercise concerns the relationships between event categories and the time intervals in which they occur.

a. Define the predicate T

(c, i) in terms of SubEvent and G .

b. Explain precisely why we do not need two different notations (A and A) to describe conjunctive event categories.

c. Give a formal definition for T(p V q, i).

d. Give formal definitions for T(^p, i) and T(^p, i), analogous to those using V and V.