אלפבית (שפה פורמלית) (Hebrew Wikipedia)

Analysis of information sources in references of the Wikipedia article "אלפבית (שפה פורמלית)" in Hebrew language version.

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274^th place

120^th place

springer.com

Ebbinghaus, H.-D.; Flum, J.; Thomas, W. (1994). Mathematical Logic (2nd ed.). New York: Springer. p. 11. ISBN 0-387-94258-0. By an alphabet ${\mathcal {A}}$ we mean a nonempty set of symbols.