Functional programming (函数式编程)VS Imperative programming(下令式编程)
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
http://msdn.microsoft.com/en-us/library/bb669144.aspx
λ演算
http://www.hudong.com/wiki/%CE%BB%E6%BC%94%E7%AE%97