© 2008, 2009 *KnowledgeToTheMax*

**States and state-spaces**

A “state” is
a description of a set of real objects and is an example of a proposition. For
example, *rain in the next 24 hours* is
a description of a region of the Earth and is an example of a proposition. That
a state is a proposition, ties the notion of a state to logic.

A
“state-space” is a set of states of a real object that is “complete,” in the
sense that the real objects referenced by the state-space are described by
exactly one state in this state-space at any given instant. The set {*rain in the next 24 hours*, *no rain in the next 24 hours*} is an
example of a state-space.