Since languages are just sets of strings, this book will talk about sets and the associated concepts of relations and functions, using yet another special-purpose language. 由于語(yǔ)言只不過(guò)是字串集合，所以本書(shū)使用另一種專(zhuān)用語(yǔ)言來(lái)講述集合和與集合有關(guān)的概念，如關(guān)系和函數。
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