其余元素組成的表
() 原子(單元素)是結構上不可再分的可以是一個數或一個結構而表帶結構本質就是廣義表因作為廣義表的元素故稱為子表()大寫字母 ()小寫字母 ()表中元素的個數()表展開後所含括號的層數
深度
()() ()(()) () ()
head(head(tail(tail(head(tail(tail(A)))))))
表展開後所含括號的層數
() ()
head(head(tail(LS)))
head(tail(tail(head(tail(head(A))))))
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From:http://tw.wingwit.com/Article/program/sjjg/201311/23063.html