알파벳 (형식 언어) (Korean Wikipedia)

Analysis of information sources in references of the Wikipedia article "알파벳 (형식 언어)" in Korean language version.

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274^th place

294^th place

springer.com

Ebbinghaus, H.-D.; Flum, J.; Thomas, W. (1994). 《Mathematical Logic》 2판. New York: Springer. 11쪽. ISBN 0-387-94258-0. By an alphabet ${\mathcal {A}}$ we mean a nonempty set of symbols. |quote=에 지움 문자가 있음(위치 20) (도움말)