scholarly journals Decision procedures for elementary sublanguages of set theory VII. Validity in set theory when a choice operator is present

1987 ◽  
Vol 40 (3) ◽  
pp. 265-280 ◽  
Author(s):  
A. Ferro ◽  
E. G. Omodeo
1990 ◽  
Vol 6 (2) ◽  
pp. 189-201 ◽  
Author(s):  
D. Cantone ◽  
V. Cutello

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