Exercise 5.9. Suppose P and R are atomic propositions. Show that P⇒ R is equivalent to its contrapositive and that P = → R is not equivalent to its converse. For the latter, illustrate with an example using a language by choosing P and R such that P ⇒ R is true and its converse is not.

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Exercise 5.9. Suppose P and R are atomic propositions. Show that P ⇒ R
is equivalent to its contrapositive and that P ⇒ R is not equivalent to its
converse. For the latter, illustrate with an example using a language by
choosing P and R such that P ⇒ R is true and its converse is not.
Transcribed Image Text:Exercise 5.9. Suppose P and R are atomic propositions. Show that P ⇒ R is equivalent to its contrapositive and that P ⇒ R is not equivalent to its converse. For the latter, illustrate with an example using a language by choosing P and R such that P ⇒ R is true and its converse is not.
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