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到目前计算机科学和人工智能关于符号系统已有极其完善的观念.H.Simon和我把符号系统称为物理符号系统,其前加“物理”二字是要说明二点:其一是想强调该系统是物理上可实现的系统;其二是想使人们了解该观念提出的来源,也就是说符号系统的观念是对人的符号行为的恰当的见解,是一种经验的发现.在一符号系统中首先需要有某种物理媒介——符号就是该媒介中的模式.只要你能区分某些物理世界中的模式、参量,至于我们谈论的系统具有什么样的物理特性是没有关系的.事实上相互能区分的模式的供应是无穷无尽的.究竟你具有的符号是一无限的集合或是一极大的数量,关系是不大的.这是一个重要的概念.
Up till now, computer science and artificial intelligence have had a very complete idea about the symbol system .H.Simon and I call the symbol system physical symbol system. The word “physics” before it is used to describe two points: Want to emphasize that the system is a physically achievable system; the second is to make people understand the origin of the concept, that is, the notion of the symbology is an appropriate view of the human's symbolic behavior and an empirical discovery. In a symbology, you first need a physical medium - the symbol is the pattern in the medium. As long as you can distinguish patterns and parameters in some physical worlds, it does not matter what physical properties the system we are talking about In fact, the supply of mutually distinguishable patterns is endless, and it is an important concept that the symbols you have are an infinite set or a very large number, the relationship is not large.