Question: Exercise 4. For a WFF , use induction to define count (,pr), which is the number of times proposition pr appears in WFF formula ,

Exercise 4. For a WFF , use induction to define count

Exercise 4. For a WFF , use induction to define count (,pr), which is the number of times proposition "pr" appears in WFF formula , e.g., count((pq),p)=count((pq),q)=1 and count(((pq)q),q)=2

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