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Paola P.

asked • 11/20/14

How do i Prove the following through natural deduction

Using conjunction elimination/introduction; disjunction elimination/introduction; contidional elimination/introduction, negation elimination/introduction; biconditional elimination/introduction.
 
1.
A -->(B-->C)
____________
(A-->(D&(E&B)))-->(A-->C)
 
 
 
2.
A-->B
~A-->~C
_________
C-->B
 
3.
C v ~C
C --> ~B
~C --> ~N
___________
~B v ~N
 
 
4.
F-->(GvH)
G
_________
F-->H
 

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