Axiomatization of if-then-else over possibly non-halting programs and tests

In order to study the axiomatization of the if-then-else construct over possibly non-halting programs and tests, this paper introduces the notion of $C$-sets by considering the tests from an abstract $C$-algebra. When the $C$-algebra is an ada, the axiomatization is shown to be complete by obtaining a subdirect representation of $C$-sets. Further, this paper considers the equality test with the if-then-else construct and gives a complete axiomatization through the notion of agreeable $C$-sets.

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