Verifying ConGolog Programs on Bounded Situation Calculus Theories

Giuseppe De Giacomo, Yves Lespérance, Fabio Patrizi, Sebastian Sardiña

Abstract: We address verification of high-level programs over situation calculus action theories that have an infinite object domain, but bounded fluent extensions in each situation. We show that verification of µ-calculus temporal properties against ConGolog programs over such bounded theories is decidable in general. To do this, we reformulate the transition semantics of ConGolog to keep the bindings of "pick variables" into a separate variable environment whose size is naturally bounded by the number of variables. We also show that for situation-determined ConGolog programs, we can compile away the program into the action theory itself without loss of generality. This can also be done for arbitrary programs, but only to check certain properties, such as if a situation is the result of a program execution, not for µ-calculus verification.