I'm designing some AI games recently. And this question that is AI a mature discipline suddenly came to my mind. My own view is that AI is not mature yet. But there're exact theory systems here in AI already, including the expert system or knowledge presenting and so on. So it becomes a problem for me that I can't convince myself about whether it's mature or not with fully demonstration. Anyone has idea about this question? Show me your proof please. Thanks a lot for your attention and help.