摘要: Model-checking gained wide popularity for analyzing software and hardware systems. However, even when the desired property holds, or model may still require fixing. For example, a ϕ: “on all paths, request is followed by an acknowledgment”, hold because no requests have been generated. Vacuity detection has proposed to address above problem. This technique able determine that ϕ satisfied vacuously in systems where are never sent. Recent work this area enabled computation of interesting witnesses satisfaction properties (in our case, those satisfy contain request) vacuity with respect subformulas single multiple subformula occurrences.