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[b][[/b]求助[b]][/b]这种问题有人懂吗? [复制链接]

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发表于 2003-02-06 07:08 |显示全部楼层
Let P1 be a program that solves L1. Let P2 be a program that solves L2. Construct from them a program P3 that solves L1 concatenate L2. Give some textual explanation for the logic behind your program P3.

Note, a string x is in L1 concatenate L2 if x = yz where y is in L1 and z is in L2. Review the reference textbook or the background module for more information on the concatenation operator. [3,D]

Based on the above construction, what result can be proven?
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