谨以此书献给我的妻子西格丽德，和我十岁的儿子沃尔夫冈，他帮助我写描绘插图7.1的计算机程序。

I dedicate this book to my wife Sigrid and to my ten-year-old son Wolfgang, who helped me to write the computer program producing Fig. 7.1.

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这篇文章献给我亲爱的妻子，今天是她的生日，我们彼此相知相爱已经11年了，而且结婚也已经4年了。

It's her birthday today. We have known each other for 11years and been married for 4 years.

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献给我们的妻子，正因为有了南希·克莱姆永不消退的热情支持，以及哈里特·莱文的无限活力和组织天赋才使得这本书成功问世。

And for our wives - Nancy Crom, whose supportive spirit never faded, and Harriet Levine, whose energy and organizational genius helped bring this book to life.

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