2) [10] Justify the steps of the following theorems, first directly and then indirectly. Include step numbers in the justifications. q V r,p ^ s, q –→ ~p =r a) Proof: Direct b) Proof: By contradiction Step Proposition Justification (1) (2) (3) Step Proposition (1) (2) (3) (4) (5) (6) (7) (8) Justification p^s ~r q Vr q → ~p ~(~p) (4) q → ~p (5) (6) (7) ~p qVr pAs Contradiction

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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2) [10] Justify the steps of the following theorems, first directly and then indirectly. Include step numbers in the
justifications.
q V r,p ^ s, q –→ ~p =r
a) Proof: Direct
b) Proof: By contradiction
Step Proposition Justification
(1)
(2)
(3)
Step Proposition
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
Justification
p^s
~r
q Vr
q → ~p
~(~p)
(4)
q → ~p
(5)
(6)
(7)
~p
qVr
pAs
Contradiction
Transcribed Image Text:2) [10] Justify the steps of the following theorems, first directly and then indirectly. Include step numbers in the justifications. q V r,p ^ s, q –→ ~p =r a) Proof: Direct b) Proof: By contradiction Step Proposition Justification (1) (2) (3) Step Proposition (1) (2) (3) (4) (5) (6) (7) (8) Justification p^s ~r q Vr q → ~p ~(~p) (4) q → ~p (5) (6) (7) ~p qVr pAs Contradiction
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