字母表 (计算机科学) (Chinese Wikipedia)
Analysis of information sources in references of the Wikipedia article "字母表 (计算机科学)" in Chinese language version.
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springer.com
springer.com
- Ebbinghaus, H.-D.; Flum, J.; Thomas, W. Mathematical Logic 2nd. New York: Springer. 1994: 11. ISBN 0-387-94258-0.
By an alphabet we mean a nonempty set of symbols.
link.springer.com
- Rautenberg, Wolfgang. A Concise Introduction to Mathematical Logic (PDF) Third. Springer. 2010: xx [2022-08-26]. ISBN 978-1-4419-1220-6. （原始内容存档 (PDF)于2022-03-02）.
If 𝗔 is an alphabet, i.e., if the elements 𝐬 ∈ 𝗔 are symbols or at least named symbols, then the sequence (𝐬1,...,𝐬n)∈𝗔n is written as 𝐬1···𝐬n and called a string or a word over 𝗔.
web.archive.org
- Rautenberg, Wolfgang. A Concise Introduction to Mathematical Logic (PDF) Third. Springer. 2010: xx [2022-08-26]. ISBN 978-1-4419-1220-6. （原始内容存档 (PDF)于2022-03-02）.
If 𝗔 is an alphabet, i.e., if the elements 𝐬 ∈ 𝗔 are symbols or at least named symbols, then the sequence (𝐬1,...,𝐬n)∈𝗔n is written as 𝐬1···𝐬n and called a string or a word over 𝗔.