# Continuous vs. discrete

[Node to be completed]

A domain is continuous if for every action a there exist two actions a_1 and a_2 such that the result of the composite action a_1 a_2 is the same as the result of a.

An action a is elementary if a \not= a_1 a_2 for any two actions a_1 and a_2.

A domain is discrete if every action from it can be represented by a finite sequence of elementary actions.