example : A -(A A B) :=

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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Related questions
Question
Solve the second question on Lean (indicated
by a star)
4.7. Exercises
Prove the following in Lean:
variables ABC D : Prop
try it!
example : AA (A → B) - B :=
sorry
example : A - (- A A B) :=
sorry
example :
- (A A B)
(A - - B) :=
sorry
example (h1 : Av B) (h2 : A C) (h3 : B → D) : C v D :=
sorry
example (h : - A A - B) : - (A v B) :=
sorry
example :
- (A + - A) :=
sorry
Transcribed Image Text:Solve the second question on Lean (indicated by a star) 4.7. Exercises Prove the following in Lean: variables ABC D : Prop try it! example : AA (A → B) - B := sorry example : A - (- A A B) := sorry example : - (A A B) (A - - B) := sorry example (h1 : Av B) (h2 : A C) (h3 : B → D) : C v D := sorry example (h : - A A - B) : - (A v B) := sorry example : - (A + - A) := sorry
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