Daily Archives: January 8, 2016

“Not both” v. “Both not”

Mr. Nance,

I am having a hard time with problem 3 in Exercise 3 of Intermediate Logic.  For the first proposition, ~(J ⋅ R), the answer key says “Joe and Rachel are not both students.” For the second proposition, ~J ⋅ ~R, the answer key says “Both Joe and Rachel are not students.” Those sound the same to me. Continue reading “Not both” v. “Both not”