Question

3.1, #62
You have the right idea of assigning ~p to represent "The temp is 90"
but this is not an AND, it is an IF AND ONLY IF (IFF abbreviated).
The symbol for IFF is <-->.

Also remember that ^ means AND while V means OR.

Since the original statement says

The temperature is not 90° if and only if the air conditioner is not working, or the apartment is not hot.

The symbolic form will have
(predicate 1 IFF predicate 2) OR predicate 3
where you replace predicates, IFF, and the OR with their symbols.


3.3, #18
You are on the right track. The p -> ~r column is not correct.

Answer 1

can i get some help