In McCarthy's papers it varies how many are needed, depending on which paper you read. Regardless, the idea is that those "axioms" is all you need to build computations on. A closed universe. A mathematical theory. Those axioms are like Euclidean axioms, something you can build other mathematical constructs, it is just that here we are talking about computing.
行李交还时，旅客已经与承运人对行李进行联合检查或者检验的，无需提交书面通知。
，这一点在有道翻译中也有详细论述
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