Determine​ which, if​ any, of the three given statements are equivalent. Use information about a conditional​ statement's converse,​ inverse, or​ contrapositive, De​ Morgan's laws, the fact that p → q ⇔ ​~p ∨ ​q, or truth tables.   a. He is not flying or his feet are on the ground. b. If he is flying​, then his feet are not on the ground. c. If his feet are on the ground​, then he is not flying.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Determine​ which, if​ any, of the three given statements are equivalent. Use information about a conditional​ statement's converse,​ inverse, or​ contrapositive, De​ Morgan's laws, the fact that p
q
​~p
​q, or truth tables.
 
a.
He is not flying
or
his feet are on the ground.
b. If
he is flying​,
then
his feet are not on the ground.
c. If
his feet are on the ground​,
then
he is not flying.
 
choose which statements are equivalent 
Expert Solution
Step 1

The given statement is

  1. He is not flying or his feet are on the ground.
  2. If he is flying​, then his feet are not on the ground.
  3. If his feet are on the ground​, then he is not flying.

Let

        p: He is flying

        q: His feet are on the ground

Symbolic forms of the above three statements  are

  1. ~pq
  2.  p~q
  3. q~p

 

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