1: assumption 2: A assumption 3: B assumption 4: assumption 5: A-B assumption . 6: C hyp 4 7: (А- B) -С intro 5-6 8: elim 1,7 9: C-D intro 4-8 10: B-(C-D) intro 3-9 1: intro 2-10 12: intro 1-11 elect one or more: line 8: A - B line 11: (A B) → C) → D line 1: ((A B) C) D line 1: A (B- (C D)) line 8: D line 11: A - (B→ (C → D))
1: assumption 2: A assumption 3: B assumption 4: assumption 5: A-B assumption . 6: C hyp 4 7: (А- B) -С intro 5-6 8: elim 1,7 9: C-D intro 4-8 10: B-(C-D) intro 3-9 1: intro 2-10 12: intro 1-11 elect one or more: line 8: A - B line 11: (A B) → C) → D line 1: ((A B) C) D line 1: A (B- (C D)) line 8: D line 11: A - (B→ (C → D))
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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