这些贡献包括编程语言和数据类型的公理化，形式验证，形式规约与分析。

These achievements include the axiomatization of programming languages and data types, formal verification, and formal specification and analysis.

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文中重点研究了采用图规约法对TCPN工作流网模型的验证，提出了流控制结构的图规约规则，并对这些规则进行了证明。

The verification of the model of TCPN workflow nets by means of graph reduction was mainly considered, and some graph reduction rules of flow control structure were put forward and proved.

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提出一套利用B方法中经典AMN记号表达时态规约的函数结构方案以支持实时软件系统的规约和验证。

A scheme of temporal specification using function construct of classical B AMN is proposed to support specification and verification of real-time software system.

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