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Modal Formulas are Either Elementary or not ΣΔ-Elementary

J. F. A. K. Van Benthem
The Journal of Symbolic Logic
Vol. 41, No. 2 (Jun., 1976), pp. 436-438
DOI: 10.2307/2272242
Stable URL: http://www.jstor.org/stable/2272242
Page Count: 3
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