Functional programming (函数式编程）VS Imperative programming(命令式编程）

http://en.wikipedia.org/wiki/Functional_programming

http://en.wikipedia.org/wiki/Imperative_programming

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http://msdn.microsoft.com/en-us/library/bb669144.aspx

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λ演算

http://www.hudong.com/wiki/%CE%BB%E6%BC%94%E7%AE%97