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strings_and_languages [2007/05/05 19:17] vkuncak |
strings_and_languages [2009/04/28 20:39] vkuncak |
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| \end{equation*} | \end{equation*} | ||
| - | We use centered dot for string concatenation, as in $s_1 \cdot s_2$, and we sometimes omit it, as in $s_1 s_2$ (programming language Objective Caml uses ^ to denote string concatenation; other languages often use + as an overloaded operator, but we will not use + for concatentation). | + | We use centered dot for string concatenation, as in $s_1 \cdot s_2$, and we sometimes omit it, as in $s_1 s_2$ (programming language Objective Caml uses ^ to denote string concatenation; other languages often use + as an overloaded operator). |
| The concatentation is an operation $\Sigma^* \times \Sigma^* \to \Sigma^*$. It is associative, and $\epsilon$ is left and right neutral element: | The concatentation is an operation $\Sigma^* \times \Sigma^* \to \Sigma^*$. It is associative, and $\epsilon$ is left and right neutral element: | ||