Mathematical logic is an extension of symbolic logic into other areas, in particular to the study of model theory, proof theory, set theory, and recursion theory.
数理逻辑的延伸符号逻辑到其他领域，特别是研究模型理论，证据理论，集理论，并递归理论。
In the paper, we study these problems memtioned above by symbolic logic, and propose a formal model of RBAC.
本文针对这个问题，从数理逻辑的角度出发，建立了一个形式化模型。
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