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相关概念(3)<br />
串的运算<br />
连接(concatenation):x和y的连接时把y附加到x的后面<br />
形成的串,记作xy。<br />
x=dog,y=house,xy=doghouse<br />
指数运算(幂运算):s 0 =ε,s 1 =s,s i =s i-1 s;<br />
x=dog,x 0 =ε,x 1 =dog,x 3 =dogdogdog
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