Publishing the source code of a program is the equivalent of publishing the proof of a theorem.
公布一个程序的源代码与公布一个定理的证明是一样的。
2
The loop invariant embodies essential characteristics of loop program and has an important role to play in design, proof and derivation of algorithmic program.
循环不变式体现了循环程序的本质特征，在算法程序的开发、证明和推导中具有十分重要的作用。
3
Proof through the state predicates can reflect the state ofprogram execution.